You will see that my first message was being 100% facetious.
Unfortunately, you were being rude for more than just your first message. And, for what it's worth, a reminder of what the OP actually said:
I am also aware that the approach of a direct control over units/ armies is prevailing in EU series and we can not count on Victoria/HoI frontlines style thus, solution implemented in Imperator would be perfect compromise. Just please do not force me to give orders to dozens of armies in late game or loop-chase the low morale armies in the map with itsy-bitsy provinces.
This was their argument. They're not arguing that you should have no control over your armies, they're arguing that they want the option to give an order to an army and simply leave them to it. Frankly, that would be
massively useful. A lot of wars in EU4 will feature one or two stacks doing actual combat while a single stack focuses on sieging down some random co-beligerent. Having to manually go back and forth between the stack doing battles that actually require my attention and the stack doing literal grunt work is deeply boring.
Ludicrous argument. PDX games have the player as the spirit of the nation (CK3 has you as the spirit of the dynasty) and controlling the military to the extent one does in every game bar the monumental failure that is Vic3 is both well within the remit of spirit of the nation and completely expected.
... But, you seem to be assuming that they're arguing you should have no control over your armies whatsoever. Is it because they said the words "Victoria 3"? Who knows. Either way, it's not what they argued for, and pretending otherwise is pretty strange.
It would be. The fact is we know that provinces in PCaesar will have a provincial capital, just like Imperator, and it has already been confirmed that forts will work somewhat close to Imperator style; so siege every fort+provincial capital to take control over the entire province. That will cut down on the carpet siege issue quite substantially.
This is the system used in Crusader Kings, and no, it does not fix the carpet sieging problem at all. In fact, carpet sieging is
more tedious than it is in EU4, and I think the reason people don't notice it is because wars can be ended instantly by capturing the enemy king, which you'll tend to do for larger war goals. I don't think carpet sieging will be as annoying in Project Caesar as it is in CK3, but the truth is that there's never a world in which moving through an enemy's provinces and waiting for a bar to fill is something that I particularly care to do manually.