Even though I enjoy all consoles, the Sony offerings are not my favorites to be completely honest.
But the naming convention of the PlayStation is honestly genius, and it is something that Nintendo and Microsoft should take note.
Naming the consoles PS1, PS3, PS3, PS4 and now PS5 is just simple and elegant. No confusion for both enthusiastic gamers and casual gamers. Very marketable, and an important part of its success.
And guess what? They will use the name PS6 for their next console, and it will work better than any other name they could think of.
Just look the confusing Wii and Wii U names. Or the Xbox One X and Xbox Series X. It's a mess.
I think Nintendo should do a numbered sequel, but my idea is not to use just a 2 but a 2.0 so they can add intermediate versions... for example, a mid-gen refresh could be called Switch 2.5 or something like that.