Earlier quoted context omitted.
If only slow... it has tons of accepted bugs and nobody seems to care. Yesterday I was using Outlook 365, there was one URL in one of the emails and I needed to find other emails containing it. Trivial and one of main use cases, right. Put URL in search box, 0 finds (including email I just copy&pasted it from). Mkay, maybe non-alphanumeric chars are messing with some internal regex or similar, stripped those into bar…
I use Mail.app on macOS as my daily these days, and it’s somehow even worse than this. Especially the search function, which works in even more bizarre ways. It’s truly amazing that we have seemingly regressed in basic desktop functionality since the early 2000’s.
Just for fun, try installing an old OS in a virtual machine. Marvel at how fast the old OS runs at modern SSD speeds. Get frustrated at the random hangs, freezes, glitches, and plain bad behavior of the programs you know and love, because the slowness of computers at the time hid it all. 20 cores of unused CPU power, dozens of gigabytes of RAM laying at the ready, disk I/O hitting dozens of megabytes per second, but still loading screens everywhere.
I once tried to go back, for nostalgia's sake, just doing the things I do on an old OS for fun. The grass wasn't much greener back then, I just had lower standards.