I don't mean to alarm you, but networking was designed by boomers.

I used to use Homeplug to get network from my router front downstairs of the house to the my office upstairs and back. It's a small house, and I thought the homeplug was ok - I was getting about 150-200mbps of my 900mbps; not great but I thought it was a good as I could get. The electrics are about 10 years old but I could see there was a lot of noise and error correction when I looked at the software that came with the plugs. Simple direct wifi connection was atrocious as the walls are largely solid brick.

Then a couple of years later I read about how good they Mesh systems could be so I decided to try a cheap one. I was skeptical as wifi hadn't worked for me. I got a Google Wifi system (not a fan of google but it was a cheap system compared to other mesh networks); it has no backhaul connection, just 3 wifi points (one in front room, one in hallway and one in office), and my speed jumped to 500mbps and low latency. I also hadn't realised how bad the latency had been on my homeplug set up - it was night and day.

I have since upgraded to an ASUS XT8 system; 2 units only and I now get close to 800mbps on a good day, and 600-700mbps floor. My PC in my office is where I work (which involves high data transfers) and also game and chill, it's been a huge boon.

So yeah, Homeplug does the job but it's not great in my experience. It was cheap compared to a mesh network, but you get what you pay for. You can get some of the cheaper and older mesh systems 2nd hand on ebay - but unfortunately a good system is pricey. In my experience it was totally worth it.