Something went wrong with the 2019 models, because almost every time I hear someone complain about an intel MacBook it's a 2019 model.
I am still using my 2018 15" MacBook Pro, and it works great. About six months ago I brought it in to Apple because the keyboard backlight quit working. Turns out the battery swelled and damaged things. So they replaced everything, top case (with keyboard and trackpad), logic board, LCD display, and battery. I still have AppleCare so this was all done free of charge. Prior to that I had zero issues with the laptop in the 6 years I owned it.
Now my M1 Air has had a logic board failure, and the LCD cracked all within two years.
That could also explain many of the other issues, such as poor battery life, slow charging, CPU throttling, etc.
In general though, I have had a terrible experience with Apple's QA as well. I've had 4 Macbooks over the years and they all had multiple (usually different) things that really sucked and drove me insane.
> The battery swelling happened after the other issues (like not sitting flat on the desk).
I had 2 x86 MacBooks that had issues with batteries swelling. Not sitting flat on the desk is simply the first symptom of the problem. Once it swells up a bit more the keyboard starts to show problems.
I think the main issue with those machines was thermal management. That Intel chip got too hot and that affected the battery as well. I used mine quite intensively and they regularly ran hot even with the fans running full speed.
I used one of those for work until last year, don't know what you call typical but it did last for 4 years without major problems so maybe that was atypical.
It made a noise like a hairdryer when starting Teams (but then, even my new M3 doesn't like Teams). Also, the spacebar did sometimes trigger twice but not often enough to make a fuss about. First MacBook Pro I've used that didn't need replacing something during warranty ;).
I also didn't realize (or remember) the power requirement for clamshell operation; my laptop is being charged by the monitors it's plugged into.