They complain because lightning is widely used yet and still being worked on and having updates but I have yet to see anyone accept nano and the majority of shitcoins. Nano is a shitcoin meme at this point where the users all parrot each other but no one spent anytime to see if what they were saying was actually true.
This is something alt fans seem to find impossible to wrap their heads around. Most of them are code with nominal value that could vapourise any second. Anyone can come up with some bells, whistles and 'partnerships'. Anything can be faster than Bitcoin if no one's using it and you cut whatever corners to manage it, or don't even check there are corners.
Building education, acceptance and trust is the absolute monster task and I'm not convinced anything other than BTC will manage it.