Okay, hot take time.
I don't like how Fabric split the minecraft modding community in two. It was already bad enough getting modpacks together with so many moving pieces and requirements causing hours worth of just trying to get everything to load properly without crashing on launch, but now with Fabric some mods have jumped from the forge ship entirely and there's(at least to my knowledge) no way to run Forge and Fabric mods at the same time which bugs the hell out of me when I find a cool mod but I look and see it's Fabric only. Like idk it's mainly a pet peeve of mine, I don't want to install an entire nother mod loader just to play 1-2 interesting mods when Forge already has dozens that I like more.
TBH that's completely understandable. For me personally, I support Fabric mainly because in my eyes, it does everything Forge does but at a higher compatability rate for its ecosystem and offers a better overall community experience thanks to its opensource nature. It's a lot harder to figure out why something is broken on Forge IMO than it is on Fabric.
That's not even to say I hate Forge, I definitely don't, I just think both it and OptiFine are behind the times and aren't adapting to the current MC's landscape very much. OptiFine is way worse than Forge, though, mainly because it's slowly starting to fail at what it was originally supposed to do: Optimize Minecraft's rendering techniques, but nowadays it's working
against Mojang's code and vanilla efforts, and isn't even playing nicely with Forge now. Fabric's community is just tighter knit and just...Works, for lack of a better word. Forge just feels like its community and biggest modders have never been on the same page.
Again though, totally understand where you're coming from: I was playing back in the 2012 days and remember the annoyance of the ModLoader VS Forge wars; A non unified community is never good.
Ironically, even moreso than Forge, Bedrock is even more stable, because it has an official modding API. ...Unfortunately, a lot of the old guard hates its guts still I think, and doesn't want to touch it with a ten foot pole. Which is unfortunate, as there's a lot of opportunity with Bedrock: I'd actually like to see that community grow the most, TBH.