In a previous (three-bedroom Victorian) house, a mesh solution improved poor signal - it just allowed that signal to travel the length of the house from back bedroom where the phone line terminated, to the living room where we wanted to watch Roku TV (streaming over wireless). That was ADSL copper wire link to the internet, and a cheapo router which was new 5 years ago. it was good enough for HD TV via the Roku which had been stuttering or just dropping out before the mesh. But whenever I wanted to download a security update for the laptop or transfer a large file, I plugged into the router with a cable and got speeds twice as fast.
I know that gamers appreciate fast connections for the advantages that gives in multi-player games played over the internet.
I guess those powerline adapters aren't great because there's other things happening with those power cables. Not tried em though.
So a mesh would be better. A network cable better still.