RE: Raspberry Pi Foundation now recommends 64 bit operating system

64 bit version has been around for a long time, all the way back since the Pi 3 release. It was also just listed but not recommended. They are now fully recommending it.

I believe there has been two released of 64 bit, one was Raspberian 64 bit, then one when they migrated to Ubuntu which was basically compiling everything for ARM and hope for the best. Since then, they have made a lot of improvements to optimize and make sure things work on ARM and not just "compile and pray".

There are still some known issues, but the list is fairly short, but there is no question other things they haven't tested may still have problems.

Basically it has been improved greatly but your mileage may vary. Test for your own situation, and hopefuly you report what doesn't work so it can get addressed.