I bought the latest Intel MacBook Air and after few months they released M1 MacBook Air. Then they release an update, I did as I should, and it broke my laptop! I lost all my data! They fixed it for me in a couple of weeks without providing me a substitute! And they were arrogant enough to behave like they did a favor to not charge me for the repair! It was 2020! My MacBook Air never became like before, and it died a couple of times in a year, which it recovered by itself. And some months ago it died, and it didn't recover! I lost lots of data I spent thousands of hours and I trusted that I can have them even if my laptop dies. Now, I have no way to recover my data!
This exact thing happened to me with the update to Catalina. Had to send to fix, they were pricky arses over the ordeal. Sent back, it was never the same. Actually started seeing rainbow loaders.
The most damning permanent damage was that the wifi card never worked properly again and I had to connect an adapter, then a usb to ethernet adapter and use that. Which meant I had to sit in a specific disk at work if I wanted to use that computer.
To me, Catalina is the Vista of the mac world.