It's a tablet, it's not a laptop, and it's not meant to replace a laptop, they have pretty good ones in the MacBook and MacBook Pro. Now that they've released the iPad Pro, it now marketed as a professional device and needs professional featured like SMB, external drive support, and more multi-window multi-tasking features. It make sense to separate the OS between the iPhone and iPad because the use case is so different now between the two devices. Before it literally was just a giant iPhone and used as such, plus not knowing if it was going to sell well, why spend the R&D on a brand new OS if you don't know the ROI. All the 2-1 computers suck at both, the screen real estate isn't large enough and CPU beefy enough to be a laptop without killing the battery, the tablet feature in Windows is half baked making easy tasks too onerous, and too damn heavy to carry around. So instead of trying to cram everything all in one device like most PC devices, they focused on what the majority of their users want, simplicity in execution. The majority of users use it as a tablet with their fingers and not a laptop replacement why bloat the OS with features that 5-10% of users want killing performance/reliability... and if it doesn't satisfy your workflow, don't get it. But *****ing about how it can't replace a laptop is stupid, that like buying a Toyota Corolla and wanting it to go 0-60 in under 5 seconds cause you want it as a sports car as well as having the cargo of a pickup truck. Buy the right tool for what you need it for.