Balance in HotA.

Another interesting point is that these objects will significantly reduce the need to build chains, which cause confusion (and in some cases, even rejection) in the minds of new players, and generally don't look very good from the perspective of game logic and common sense.

This contradicts the principles of Heroes balance. It's not about simplifying the gameplay, but about making it more complex.

It's not very clear how a Pegasus stable or various portals to troops could make the game more complex.

The argument about variability is not convincing; variability doesn't make the game more complex in itself, but when there are several options with different advantages and disadvantages, so you have to compare what is more important. The proposed objects don't offer much in this regard – the effect is simple and clear, and the difficulty is only possible geographically (if they are inconveniently located). Moreover, if the location is convenient, the effect becomes overwhelming. For example, an external Town Portal doesn't have this drawback.

I agree about speeding up the gameplay, but not at the cost of "117 flew into the main opponent's base" (on Diamond-MiniNost, this is easy). This will be the case with cheap stables that spawn on standard resource locations.

And if you make the stables worth 20000+ resources, so that they only spawn in treasure locations and are guarded by strong creatures, what will they differ from wings? And by that time, the Pegasus upgrade will clearly lose its relevance. The same external Town Portal is relatively cheap precisely because it is intended for early use, when you don't have your own Town Portal.