Valid points you raised. It is, however, worth noting that there have some changes in the Bitcoin network. Like the implementation of Lightning Network. Whiles this is not complete Full force I have started feeling it's effect. Thus Bitcoin transactions are much faster now than they were towards the end of last year, they've improved drastically. The fees have also come down significantly.
But a lot still needs to be done for Bitcoin to remain at the top if it to continue being the ring leader. I do understand why shops would want to move away from it, due to the reasons stated. There's better technology now too, that is a thousand times faster. Literally. And for some, BTC is a store of value now, like Gold. I think there is still a bright future ahead of Bitcoin though