I've been on both sides of this argument at one point or another. Bit of a chicken and egg situation really.
On one hand, sol ring and mana crypt are, imo, the two most powerful cards in the format in a vacuum. The degree to which they outpace modern mana ramp is pretty absurd. The command zone is complaining about 2 cmc rocks that tap for 1 while sol ring costs half as much for twice the benefit. Modern equivalents cost 4. I've certainly had plenty of games go off the rails quickly because someone had fast mana on turn 1 and went unanswered. Powerful decks can get out of control very quickly when they have a sol ring/mana crypt start.
On the other hand, while expropriate on turn 6 is worse than one on turn 8, I still have a bad time when it gets cast regardless. A lot of the big top-end wincons that wotc has printed are, imo, obnoxious on any turn. Losing to the same combo I've seen a thousand times, losing to a 1-card-wincon, losing to some tedious storm combo that takes 15 minutes to resolve - these aren't good experiences, not on any turn. And I think there's the issue of recency. Sol ring has existed since the format's inception, back in "the good old days". People complained about it back then too (myself among them) but a lot of what tends to piss older players off is the direction the format is going, and the thing changing the format is new cards, not old ones.
But then, I think another thing that's changed is the philosophy of the format. Not from the RC, but from the people actually playing it. Even back in '09 there were annoying metadecks that could dominate the field, but people tended not to play them because (1) they were expensive (2) people weren't as aware of them (3) there was a clearer philosophical delineation between cEDH and EDH. Take the card pool of '09 and transplant it to today, and would it still be "the good old days" or would it be more like today, with a lot of people playing groaner commanders and a lot of games ending abruptly to the usual suspects? Hard to say, really.
I do find myself agreeing with materpillar to the extent that the presence of a sol ring doesn't drastically change the enjoyability of the game, even turn 1. If someone combos off on turn 3 because of sol ring, well, they were still going to pull of some nonsense at some point. The key issue, imo, has always been that with such a huge influx of players, the goal of commander has gotten muddled, with different people wanting different things. I think also the popularity of the format putting more people in public environments instead of insulated ones means a lot more clashing of philosophies. When the influx of new players was relatively small, I think it was easier for them to absorb "the vibe" and be peer pressured into a similar power level as everyone else. So yes, everyone runs sol ring, but nobody runs
Mind Over Matter because that's just not the sort of thing that's acceptable. But as more people come into the format, the easier it is for people who aren't interested in the social philosophy and are more interested in breaking things to find common cause with other people, and to spread that perspective. So now there's more and more people pushing the envelope further and further, and a much greyer area between EDH and cEDH. And now some of the flaws that were more latent in the format - sol ring - become more and more pronounced.
From a practical standpoint, there are a lot more obnoxious endgame %$#%$#% cards than there are sol rings. It would be really hard to slow things down appreciably by banning those cards, and wotc is always printing more. Ban sol ring, ban mana crypt, ban demonic tutor, ban vampiric tutor...the format will probably slow down a bit. Will actual it become more fun to play? Maybe, though I don't expect the ways people win are going to change. To me, I think that's the bigger problem. Ultimately, while I could say that the only way to fix the format is to convince everyone to play like we did in '09, of course the reality is that the cat is out of the bag. We could ban fast mana and efficient tutors, and maybe we should, but I don't think it would actually make a huge difference. I don't think anything can make a difference. The format is just different now, and I don't think we can blame it on some small number of cards. It's everything - the gradual power increases from wotc, the availability of deckbuilding information, the ease of buying powerful cards, the massive influx of new players, the shift towards public play, the conflicting philosophies of players - It's a holistic issue, and unfortunately I think there's only two solutions: learn to live in this new format, or stop playing.
I guess that got away from me a little.
Stp is only the 5th most popular card, behind signet, greaves, and boots.
That said the mental misstep argument (against you) is pointless anyway since you're running it for memes and acknowledge it's probably not a good play. It's not legitimately warping deckbuilding if the changes being made aren't intended to be effective. It's not really a problem until running narrow answers is actually the correct play.