Yeah it is horrible how you can't repair or replace anything but it does work so damn well and I have had so much hassle with other laptops that I just thought fuck it and went with the MBP.

I had a Surface Book 2 which was one of the worst laptop experiences I have had in the past decade and it was close to the MBP in price. Microsoft waaaay over-engineered the Surface Book just to be unique yet still don't have the software experience good enough to be totally reliable.

I have never had my MBP fail to wake from sleep like my Surface Book for example. Or the daily need to detach/reattach from the base so that the backlight for the keys works properly, etc. So many weird quirks with that thing.

You can get third party parts for your MacBook and replace them yourself.

And there are detailed guides from iFixit about how exactly to do it.

It's technically possible, but they don't seem to have a tonne of parts available, especially for the new models (2016 onwards). Also, pretty much every component is soldered to the logic board (memory, ssd) with a few small exceptions, and the computers can be more difficult to open.

I haven’t found this to be the case at all. Plenty of sellers have components for the newer models as well of course eBay.

And the computers are almost exactly the same to open. I just replaced the thermal paste on my 2017 MBP and it was just as easy as my 2012 one.

Hasn't the inability to upgrade or repair the MBP been true for the last couple of generations of MBP as well though?

Previous generation was slightly more upgradeable. You could upgrade the SSD, though only 1 or 2 vendors sold products that worked, and you might have to jump through some firmware issues.