As I expected, you see PvE only as PvP. No, it is not like that and I will show you examples below.
But first, current bots are good enough to be put against average player. So, they can replace players in PvP battles.
Example 1. WT Live // Mission by KatukovM
This mission is designed for the planes pair Su-25SM3/Su-27
Phase 1. You should help bot Mig-29 fighting against bot F-16. When you play Su-25SM3, you do not have radar to detect enemy. So, it is quite challenging to complete this part. F-16 always kills Mig-29, so you do not have much time for help. This part is really hard for average player, especially in SB mode.
Phase 2. You should kill AA + planes on the ground. This part is designed in a way that player should use cannon or unguided weapon to complete this part. It is quite challenging for average player.
Phase 3. You should kill planes that hunt for Su-25 bot. But these planes can hunt for you as well. Bots appear randomly + they fly between mountains, so it is not so easy to find them before they reach Su-25 and kill it. Especially is SB mode.
Overall, I play this mission over and over again and it is much more enjoyable than playing current SB EC.
Example 2. WT Live // Mission by KatukovM
Phase 1. Kill enemy convoy. The challenge is to do so from 3.5km range. Looks like easy task for APFSDS rounds, but the convoy has trucks as well, so player should use other types of shells as well. And this part is quite challenging since there is no refill.
Phase 2. Switch to heli and help tanks to kill enemy tanks. The challenge is tanks looks a bit similar. Also, enemy tanks have automatic protection system. So, simple shooting at any tank does not work.
Phase 3. Suicide trucks chase our tanks to explode them. You should kill those trucks.
Planning to remaster this mission, so trucks will appear at random position as well.
As a conclusion, PvE is more about immersive gameplay with specific tasks, not about royal-battle gameplay like current SB EC mode.