All of that is true but... If there are no answers given, how is the newcomer going to know if they are anywhere close. Many texts have answers for the odd problems, some have separate books where the answer to odd problems is fully explained.
Yes, but TAOE is not like the many other electronics textbooks out there. It is really not about the exercises. Yes, the early chapters have exercises scattered here and there throughout the text and some of those chapters have a page of exercises at the end of the chapter. But they are not calculation heavy and are meant more to get one thinking in the right direction . Whether they get the answer exactly right is less important IMHO.
Most of the later chapters have few or no exercises. It's just not that kind of textbook (thankfully!).
If it's important to one to have someone tell them their answer for one of the relatively few exercises is correct then there's plenty of forums - including this one - where someone will oblige.
But if you delve into lots of math, SPICE, or math software packages in order to answer the exercises you're far off track from how TAOE is meant to be used. IMO if they'd meant it to be used that way, there'd be a lot more math heavy exercises all through the book with answers available, etc. - just like the scores of other electronics text books out there.
Granted, this approach is not for everyone. For those who like lots of math and lots of exercises with concrete, easily verifiable numeric answers you have many good choices of textbooks.
Personally, from a pedagogical perspective, I think Horowitz and Hill get it just right. But it's horses for courses - of course!