No, it's not forced at all. It just cannot limit BBB that easily.
This is forcing AAA to do more micromanagement to prevent other empires from exploring the territory. The less your opponent knows, the easier it is to be a leader.
If you allow scouts to quietly run through foreign territory, then agreements on open borders and the purchase/sale of maps of the area will lose all meaning. Open border technology becomes available around turn 150-165. At this time, all empires already have a decent territory and the center of the empire cannot be seen from the outskirts. However, each empire's territory is not monolithic and has many holes where there are no borders - hills, deserts, mountains.
Plus, the player can simply exploit this proposal - he can place scouts in these holes in advance before war is declared and immediately plunder a decent part of the AI’s territory and all the caravans. Each caravan gives 4 victory points.
AI would also be able to move a unit which is stuck in current rules. In fact, AI would benefit more from it, since it's more stupid on average than a human when it comes to control.
The AI has absolutely no problem producing new units. AI produces dozens of them during wars. One unit has no meaning. In the early game, the AI often uses 4 or more pathfinders Which are often killed by barbarians or other AI.
Yes, you can also simply declare war to kill the scout.
And get a warmonger penalty for killing one scout. Quite a ridiculous reason.
With the current rules I can safely wait until this unit is removed or the AI buys open borders.
It's not just for people. AI would benefit more from it, because it's forced to auto-explore.
The AI will easily produce a new unit and send it to explore the territory.
Also, imho this proposal makes the game more convenient than easier. It also help recon units to be more distinct than mounted units.
Recon units are unusually strong if you select the right promotions for them.
A pair of recons with regeneration can constantly harass the enemy from the rear, preventing the active use of cannons or archers and drawing off infantry and cavalry. A recon in the forests is a very difficult obstacle to overcome, since with regeneration he does not need to stand still for healing - he can simply run through the forests or desert within a radius of 10 tiles and hit an enemy every 2-3 turns. Plus provides flanking attack bonuses by simply running up to the enemy and running away further on his business.
If it were not for the overabundance of AI units from the Renaissance, then a couple of recons would be able to almost completely paralyze and plunder the entire enemy territory.
The Conquistador (Explorer) unit with regeneration alone is capable of capturing almost any city before the Industrial Era, regardless of the type of garrison. I now remove this unit if I receive it as a gift. He's too strong.
Commandos are offensive units for war on another continent. More effective than the Foreign Legion, again thanks to regeneration and the absence of terrain penalties. Plus they are treated outside friendly territory for an additional +5/+10 HP.