I've switched back to Firefox for a few reasons:
1) Arc is based on Chromium, and I don't want to support Chrome
2) I just couldn't get used to the layout with the tabs on the side instead of the top. It makes the the window narrower, and I found that this worsened my experience on many websites. Yes, you can hide the sidebar, but it's a pain in the ass to always toggle it.
3) I don't think they'll be around in a few years. They're heavily VC-backed, and while they say that they want to monetize via paid team features, I don't see how they could generate enough money to justify VC-style growth. Most likely they will be sold and integrated/closed, or they will shut down.
4) They're "quirky" CEO that does all these videos and weird product updates really irks me in the wrong way. I realize that this is subjective and others might like it, but still.
I think this sort of ignores the fact that S&M agentic tools exist and the cost of those services is also dramatically decreasing, so does it net out and just become a more efficient model in general?