I want to summarize my thoughts on experience.
Negative aspects:
1. Simplification of the game (simplification of map exploration). 2. Difficulty in predicting the strength of an army. 3. Difficulty in predicting the first turn in the fast game. 4. Battles add an additional bonus, i.e., by fighting a battle, the player receives:
a) a bonus in the form of experience for the Hero
b) a defended object
c) and additional experience for the monsters.
5. Increased influence of randomness: one player gets five stacks of zombies, golems, and mummies, while the other gets five stacks of archers and fast flyers, and according to point 4, the imbalance will increase.
6. Weakening the importance of high-level monsters: with a Miner and two trog nests, you can only build mushrooms, a portal, and a Castle; nothing else is needed.
7. Accumulates a bonus in the 1st place without any difficulties or tactical maneuvers, i.e., by fighting battles in a chain:
a) the experience will be gained not by the main hero, but by the one who fought in the chain
b) the defended object still needs to be visited/transferred/used
c) but the experience will be credited to the monsters and will accumulate their strength.

Positive aspects:
1. Acceleration of the game (but at the expense of simplification)
2. Increased skill factor (but again, at the expense of points 4 and 7).
3. Reduces the importance of high-level monsters.