Why wireless package is inserted into main, when device dont support wireless? its funny.
Because you might want to use CAPsMAN on the device? So it is actually not that funny.
You must to have other AP to use Capsman.
Yes. And then you can use the RB750Gr3 to manage it. And for that you need the wireless package. When you don't want it,
you can disable it. Just like MPLS (are you using that?), hotspot (only useful when you have an AP), and in many cases routing as well.
One nice property of RouterOS is that almost the same software is running on all the models, and you can customize it.
When you want to keep iterating that this is funny or strange, maybe it is not the ideal system for you.