[ANNOUNCEMENT] Heroes 3: World Tournament - an add-on for tournament games.

estates + diplomacy = 400+400 movement points, + stables 400 + navigation = +600, + logistics = +600 (boots + spurs = +600) = 2000+2400 (+600) = 5000... when will games with such features end? Always on the second turn?)

Navigation itself doesn't add any movement points; it only provides a speed boost. You've already accounted for the speed boost when you calculated 2000 movement points + 600 bonus from logistics.

Now imagine that all of this takes up 4 slots, which could be occupied by skills that are much more useful. In any case, this is less than what it was with classes - there was an explorer +600 and a merchant +600. Moreover, the focus here is on gaining speed skills for mages.
Perhaps adding diplomacy to increase the merchant's purchase volume is unnecessary, but it's not obvious to me.
And in general, call Vik, he'll explain everything; he's the one who came up with it :)

Bring back the classes. They are needed as a feature that you can play with or ignore. Right now, it all looks very unbalanced.

There's no point in repeating myself on this topic. The reasons why they abandoned classes have been stated in this thread.
"Needed as a feature" - this should be understood as the appearance in the game of a colorful picture with a description of the classes, most of which are not used in the game. In fact, without classes as such, their functionality will be in demand.