Upon observation, that huge community of developers appears to still be mostly building apps and altcoins on top of ETH and cashing out on BTC exchanges because that's what everyone uses and it's how you make the most money. These coins have not diminished in popularity, the huge community has only increased their popularity. If you take issue with cognitive bias then take it up with them. Like I said, I will concede this point when that changes and all the proof-of-work coins are gone, and the BTC maxis go away and stop having so much influence, but that has not happened and I am very skeptical that it ever will without also taking everything else you'd describe as "web3" with it.
I used to be very interested in defi but I can't anymore when it's evident that the same market forces and consolidation and network effects keeping traditional banking afloat are also keeping BTC afloat because too many people are invested in keeping it the dominant coin. I really hope I'm wrong and BTC is not "too big to fail" but if I am then I expect you'll see these fancy web3 startups pivot back to making "boring" web 2.0 banking systems because there is no big money in defi anymore.