Other half replaced her Mini 2 with the latest Mini 5 a few months ago. She plays a lot of games and some of them had become unstable, possibly because of RAM shortage. The Mini 5 has fixed all that, and has been rock solid. She allowed it to update to 13, as far as I know, all is well.
That said, apart from a few specific games Apps that were crashing, the Mini 2 was also rock solid.
If the Mini 2 is acting up, running slow and/or crashing a lot then sure the Mini 5 is likely to be better. Or if there’s some 13.x feature that you need, the Mini 5 will provide it. But otherwise I’m not sure we’d have bothered. Mini 2 may be 6 years old, and stuck on iOS 12, but still a capable tablet, looks and feels pretty much identical to Mini 5.
Just my opinion.