Most of these merchants do not operate globally, they are only providing services in the US or Europe. This is one of the major problems if think about Ethereum adoption. Whereas many Merchants that accept Bitcoin do operate globally.
I think bitcoin started like that too. Eth is just merely 5years compared to bitcoin, I think you must give them some air for while and wait for the adoption to expand globally. Like what OP said its not fast, at least Eth can be used on defi and dApps which clearly lack on bitcoin.
There are always pros and cons but seeing these merchants accepting eth too aside from bitcoin also added in the progress of the blockchain as a whole.
Thanks OP for a super long list. This is like a complete compilation of eth stores. Would you update this thread for more additional? Hope so, cause if you have the time this will very be helpful.