Which advertisement said it was "a general computer"? If you're referring to the advert that asked "what's a computer?" then that's a wholly different proposition to being "a general computer."The product line that advertised as a general computer, but in fact is either a drawing device or YouTube player.
The iPad clearly and objectively is more than "a drawing device or YouTube player." You will find members on this very forum who run their businesses from it, work from it, and know other people in their lives who use it as a primary work device.
Apple pitching the question of "what's a computer" was never designed to suggest that the iPad is a Mac or can do all things that Macs can do, but to underscore how computing has changed.
Not everyone needs a Mac or full-blown desktop OS. That is a fact. The era of personal computing as it used to be was one where everyone had access to a computer with equal features, but home use barely consisted of more than consumption and emails anyway. But the features were there for those who wanted or needed them.
What more modern computing allows is for people to more accurately choose the functionality they need. Such that if you need a Mac or full PC then you can buy one. If you need that in a portable function then you buy a laptop. If you need less, you can buy an iPad. You can use the iPad and Mac in wonderful and unique ways together — we love deriding Apple for "not innovating anymore" but Universal Control, Sidecar, Handoff, cut-and-paste across devices are truly excellent innovations that make multi-device use not only a joy but also genuinely useful and intuitive.