You have two different issues, but you'd have to ask TCL about the volume buttons. I'm sure the answer is that they save 5 cents per TV by not adding buttons that most people never use. As far as connecting to Wi-Fi, you must have a physical remote unless your TV supports a wired connection. You can get a cheap universal remote that supports Roku TVs or a $10 remote from Roku:
Roku TV Remote | Replacement Remote For Roku TV | Roku
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