Working on a handheld device with fingers requires different approach than keyboard and mouse put on a desk together with the device, the trouble is with the OS

Working on a handheld device with fingers requires different approach than keyboard and mouse put on a desk together with the device, the trouble is with the OS and software not with the technical specification. If those are made for one, effective for one, will be crippled for the other. Also try using the same software on both 5" and 32" and with either finger only or keyboard and mouse only, efficiently. Good luck with that! If powerful processor and plenty of RAM would make a laptop then your Playstation was a laptop too! :)