Couldn’t disagree more, most web presences in B2C have a chat box where you can talk to someone or something on the other end. Usually they’re horrible but when they’re good they’re fucking great.
I think the other problems you outline, plus the fact that google went through this process with gchat itself (anyone remember Allo?) are probably the main contributors. As a sibling comment notes: google’s product org is meme-level terrible from top to bottom.