If it were judt about the apps, then yes of course, you‘d be right, but it‘s not. For, as we now call it, a „pro“, it‘s also about what you allow these apps to do what you don‘t (file and program restrictions, file lock, program permissions such as connectivity à la Little Snitch), how you can organize file system structures (yes you have the Files app but we are also talking about what you can do with it, which isn‘t much), from what sources you can install apps (especially talking about competitional apps) and the fact that you have a page file which ensures that you won‘t lose the session of another app judt because you ran out of RAM, which is the biggest design flaw when it comes to productivity; losing everything because you just may need to open another app.
Also, all the software and hardware interfaces do not play well with an iPad because it‘s a device for quick, small and leightweight tasks.
Us scepticals are not hating on the iPad, we love it. But you gotta love it for what it is and not what it could be. To become a device worthy to be called replacement it has to come with some fundamental core functionalities.