The assumption you are making is that everyone enjoys that playstyle. The fact that you have not come across any such gamers in 20+ years does not change the fact that it is still an assumption. (For the record, I've been gaming for a little over 28 years now, and I have come across people who would find a stream of fights intended to just were you down to be quite boring.)
Here, the assumption you made is that all resources would be recovered after a short rest. While it is correct that 5e has not been released yet, I find it quite unlikely that the designers would adopt such a paradigm, except maybe for a couple of experimental classes. In addition, even in a system like 4e, which features encounter abilities quite strongly, most classes have daily abilities (and even those who do not, have daily limits on resources such as hit points). So, the idea that all resources would be recoverable after a short rest is not only an assumption, it would seem to be one that has no basis whatsoever.
Actually, I hardly ever do (except at conventions). I prefer to create my own adventures. However, if you were running a system that featured resources that could be recovered after a short rest, and you were running a module designed for such a system, it would be reasonable to expect that the designers would take such issues into account. Of course, if you were adapting a module from another system, then yes, this is one more issue that you would have to adjust yourself.
In a way, that is correct, and is in line with the point I was making. The way to make fights more difficult is not to precede them with other fights, but to use more difficult opponents. Yes, you do trade a series of fights designed to wear down the PCs in order to achieve the occasional amusing situation when they have a hard time fighting an opponent that they would normally have no problems beating because they happen to be low on resources for a series of fights each of which carries an actual threat of defeat because the enemies are closer to the PCs in terms of power. Some would prefer the former and others would prefer the latter.
This again touches on the assumption that the PCs will get all resources back after a short rest. If certain types of resources - healing, utility, significant enhancements or delibitations, etc. - are daily resources that can only be regained after an extended rest, there will be an incentive to keep magic items of that nature around, even if other types of resources can be regained after a short rest.