from my memory, the OS on Nokias was just fine. it was great. it just wasn't a smartphone OS

which makes sense because they had these half button half touchscreen hybrid phones

the internet browsing features were something akin to like paid phone numbers which you'd avoid using because it was like special stuff

it wasn't first class in any way, it was perpetually stuck in the past. and as you can see, their entire business model was based on iterating on the same thing in a million ways, so there's no way they were gonna do something from the ground up to focus on a first class experience for one form factor which could support 3rd party developers etc.