It will improve the game because it is better balanced. If it has no side effects you can plug it into the game and nobody will notice. Except those few who wanted to use that overpowered device so they would need to use the game option. Why is that an improvement? A game option is a bigger psychological barrier. The difference is similar to whether the vanilla game has a built-in overpowered weapon or the user mods the game to change a well-balanced weapon into an overpowered weapon.
But this is not about changing the damage values of a weapon. It is not about weapons at all. An OP weapon would give me XP and loot. Avoiding the horde gives me nothing but boring 15 minutes.
The longer I think about it, the less it becomes clear to me why it all has to do with balancing at all. To avoid the horde is to trade that you survive at the expense of XP, loot and fun.
The more surgical the method that prevents vehicles from being the carefree escape the less side effects there are. I gave two examples, one would have no side effects on base defense at all and the other could have a beneficial effect on base defense if it works on all electric devices (because it would be an interesting end game zombie). Take your pick.
Both solutions would require additional development effort.
The additional mole zombies would probably need additional CPU capacity at horde night. And something like the EMP zombie is nothing like anything that is already implemented in the game. A routine would first have to be implemented to temporarily switch off the electrical traps. I wouldn't necessarily call an EMP zombie interesting. Since I like to use electric traps I would call him rather annoying.
The few loot bags you get are a drop in an ocean compared to the expenses. If you are after the xp you can just collect resources for xp and sell them or put blocks randomly anywhere and upgrade them all day, the zombie xp is also easily gotten in a few pois and you can always insert a refreshment break between waves if the last one did damage you a bit.
Just because I fight the horde doesn't mean I can't do anything else for the rest of the week. And the few resources I have to use to fight the horde aren't worth mentioning. I often collect resources just for fun and I build just for fun. Last week I finished a work base where more than half of the used resources are only used to make the base look good. I talk about 10000-15000 cement mix, 700 iron spikes and about 10000 paint.
I fought the day 56 horde this weekend. Then I repaired the base and refilled the traps. Afterwards I did a level 4 quest and collected a lot of electrical parts, mechanical parts and some brass. And I also got some XP and since I killed all zombies with my iron club, I didn't use a single bullet. So I left the POI with a surplus of ammo. By the way, this is the case with most POIs.
Next, I maybe go to the mine to collect resources or drive to the traders to sell what I got by looting the POIs to get some new quests. I also buy ammo for the next horde from the traders.
I don't feel that fighting the horde has any disadvantages for me. Probably simply because I don't think about what would happen if I avoided the horde. Probably I'd rather turn the horde off than avoid it because it's pretty boring to drive around all night.
Pointing to other problems or holes doesn't make this go away. The death loop at least has a death debuff for half a day (maybe still stacking? I don't know), by the way. A real (if still too weak) downside.
The death debuff doesn't stack and there's worse than half a day of sorting boxes in the base.
The fact that I show alternative possibilities should make it clear that even if the developers decide to restrict the possibility to avoid the horde with a vehicle, the discussion will not end. You can assume that the discussion will continue with these other possibilities.
Before A17, the target of this discussion where players with underground bases. Some even called the underground bases "I win" buttons. Now we have digging zombies and the next possibility to avoid the horde is being targeted. As long as there is even the slightest chance to avoid the horde, some players will feel bothered. But who always only looks for the next hair in the soup will never be able to enjoy the soup.