My parents use their iPad(s) for 100% of their compute needs. At 70+ years old, they will tell you those needs are minimal.
If you use one program at a time, do not need an actual file system, have no need to install software from a variety of places (Github, Vendor sites, etc), have no problem installing multiple "apps" that only work behind paywalls or not at all and you don't care about replacing a functional device whenever Apple obsoletes it... iOS is the best thing since sliced bread.
If you need anything outside of iOS's limited list of abilities, its a trash operating system that has crippled amazing hardware.
If you use one program at a time, do not need an actual file system, have no need to install software from a variety of places (Github, Vendor sites, etc), have no problem installing multiple "apps" that only work behind paywalls or not at all and you don't care about replacing a functional device whenever Apple obsoletes it... iOS is the best thing since sliced bread.
If you need anything outside of iOS's limited list of abilities, its a trash operating system that has crippled amazing hardware.