The UX of the wallet being one difficulty for adoption. There are other even bigger reasons (in my opinion) - variable mining fees per transaction being a large one.
lol I made an account just to add this reply. Are you familiar with EIP 1559? There are solid efforts currently ramping up research to change the fee market from an auction to a flat fee:
As a blockchain game developer, I have talked ad nauseum (https://steemit.com/marketing/@steem.marketing/cache-the-gam...) about reasons why we switched away from Ethereum for most transactions (but not all).
The UX of the wallet being one difficulty for adoption. There are other even bigger reasons (in my opinion) - variable mining fees per transaction being a large one.