Try this thought experiment. If you (and everyone else) had been using an iPad for years with all the functionality and limitations that implies, how would you react to the introduction of a modern laptop? Higher priced and somewhat less portable but capable of much greater functionality and processing power.
Would there be internet postings with titles like "How many use their laptop as their only computer?" You bet. And some folks would reply,"No, I still use my iPad because it's so much more portable and I don't really need all that functionality, a larger screen, and more power." But I strongly suspect that most folks would jump at the chance to replace (or heavily supplement) their tablets with a laptop computer.
The point is that the iPad benefits from being "the latest thing." As such many consumers are willing to put up with its limitations to enjoy its benefits (as well as the status that comes with being up to date.) Reverse the order of introduction and I suspect that laptops would enjoy the same benefits.