I still have all my xboxes and they all still work flawlessly. The OG, the base model xbone, and even the original white 360. I'm also not an achievement hunter at all but still have over 130k gamerscore, which just goes to show how much use each of these consoles got over the years. I had the 360 through college with four roommates! Hell up until they recently made Lucasarts' Gladius backwards compatible on my series x I was getting out the OG Box once a year just to play that masterpiece again.
I used to mod XB1's. They're basically a computer inside. Had XBMC (the precursor to KODI) installed as my dashboard. My games were all copied to the 250GB hard disk I had put into it so they loaded and ran extremely efficiently. I had emulators for PS1 games and Nintendo.
At one point, I even paid a very talented chap for an Xbox board with double RAM and a 2x faster processor soldered onto it.
You had to get a tool from online to patch your executables to be able to handle the extra processing power, otherwise many of them would run at 2x speed because they were pegged to the clock speed.