So previously there was some discussion on possibly buffing the SDKFZ 221 to make it a more useful vehicle. I think there were some reasonable points on both sides but I personally agree more that any major buffs to the vehicle's timing to power could be problematic when coming alongside the power spike OKW has in the mid game. However, I also agree the vehicle feels very meh even going just a minute or two past when it comes out. I think a buff could help it just needs to be the right one.
My suggestion is to possibly look into reworking the vet for this unit in order to make it more useful after it's combat abilities fall off.
This link has the current vet for the 221 and I want to propose some changes to it. I think the most notable thing is the AT mine buried so far in vet it may as well not exist. I want to redo the vet and shuffle things around.
Vet 1 - Unlocks the "Defensive Smoke" ability.
+10% accuracy.
-11,1% received accuracy.
Vet 2 - +30 additional health points.
+30% accuracy.
Vet 3 - Unlocks the "Riegel 43 Anti-Tank Mine" ability.
Vet 4 - +20% maximum speed.
+20% rotation speed.
+20% ac/de-celeration.
+30% sight radius.
Vet 5 - -25% received damage while in "Lockdown Mode".
+4 armor
So these changes would do a couple things overall.
Vet 1 remains unchanged
Vet 2 would now give a notably health boost to make the 221 more resilient (it would have 270 health compared to 240)
Vet 3 unlocks the AT mine making it more realistic to be able to use this ability.
Vet 4 essentially got the other buffs that were removed from vet 2 and 3
Vet 5 would now make the 221 immune to small arms fire making it much more bulky and harder to kill as a reward for keeping it alive to vet all the way up.
In terms of new stuff for the vet you have a additional 10 health points added on and the added armor at vet 5. Otherwise this is just swapping around the various vet bonuses to activate in I would say is a more beneficial and useful way. Making it so at vet 3 the 221 gets the AT mine it sets a good point where the 221 can become a more support built vehicle as it plants mines and locks down areas as a 223.
I think this would be a good way overall to buff the 221 while not affecting that much of it's early timing while still making it better and worthwhile to keep around even later into the game.
If a change like this is done I also hope we could see the 221 go into the Scavenge doctrine also in place of infiltration grenades. I think the 221 fits very well there alongside the new volk repair kits and the whole theme of extra resources. The 223 would be a good way help rush out an ostwind, save munitions for a big 105mm strike, or even as a resource sink being able to plant those AT mines.