The Scott (a backline artillery unit that take three shots from the Panther to kill) needs smoke because a Jackson can't kill the Panther in three shots?
Does the Panzerwerfer, Katyusha, Stuka, etc need smoke and enough health to survive three shots from an opposing tank, just in case an enemy tank tries to dive it? We wouldn't want there to be any way for someone to kill a backline unit, after all, even if you leave it out of position.
Katyusha and stuka and werfer are all alpha dmg units. They barrage, kill plenty of models in skilled hands and get the f*** back to base. Scott on the other hand needs to stay on the frontlines to be effective, and with 50 Autofire range, you won't be using it much except for the smoke barrage. Scott usually arrives the last, if it arrives at all (speaking for 3v3). With 50 autofire range, you won't be using it for barrages much because they are quite accurate, and against skilled opponents, you won't really kill paks or raketen or MGs. Will damage it a lot, but not kill. Most people I play against usually move the pak or MG after the first shell lands. It's not that hard in 3v3 as you're not fighting all over the map, but on a certain "VP lane". It takes 3-5 seconds to move the pak/mg to a safer spot to deny the scott barrage whilst not losing anything in terms of vision for shooting the pak (since the maps are lane-y and most sightblockers are destroyed in Scott timing).
I don't think I've ever had a scott survive if I use it to autofire against blobs (late game double paks kill it in 3 seconds). I even consider myself to be quite good at micro and using both reverse and hold fire, etc, but unless the vehicle has 99999 acceleration, you won't get out in time.
And for barrages. Again. Not really something I take to displace MGs or Paks because the barrage really is accurate. If you see where the first shell lands, you don't have to move the weapon team a lot to deny the scott barrage (eg, you see calliope or katy or werfer or stuka, you get the FU*K out because the AOE is huge).
The only real use for Scotts in late game is the smoke. Smoke is the saving grace for Scotts in teamgames. The smoke barrage is long range, has excellent spread and scatter and really blocks. You won't kill anything, but you will buy yourself some time to organize a defense/offense.
Again. This is for 3v3+. I can't talk for 1v1. I'm guessing the low AOE but highly accurate barrages are more useful there, as just damaging a unit is enough, and it's much harder to manage your army across all map, so a scott barrage will get a few hits more in, before the MG/pak/raketen... displace
Talking about the scott as a backline unit is not really transparent. It's not a fronline unit, but definitely not a backline one as well. Somewhere in between. A pak howi is a backline unit.
Scott needs a rework. All these push/pull changes won't really fix the core problem: it's overlap with pak howi. Right now they are both barraging units. Pak howi deals more damage and has better AOE (+ better veterancy) but is really really slow and easy to kill (the 5->6 models made it 1% more survivable). Scott is quite agile but has low dmg/AOE and a short autofire range.
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Both suck vs blobs:
Pak howi because it's slow to rotate and fire, and after the last AOE nerf, doesn't punish as much. Also, the shells take quite long to land.
Scott because it has low AOE but high accuracy (you generally want scatter vs blobs for both shock effect and more dmg) and short autofire.
Why scott was not given an autofire mode that actually has decent AOE/dmg and a barrage that has a high scatter (as to not be good vs single MG/pak). And pak with a high scatter autofire but high dmg/AOE barrage (so it's good vs static, bad vs mobile).
Scott would also be made a 2 shot unit and target size reduced to 17 (currently it has 19 target size which I think is a bit too much; StugE which has more armour and HP and really is larger, has 17 target size).
So in the end you would have an autofire specialist Scott that could somewhat deal with blobs and a pak howi with a inaccurate autofire but deadly barrage. Scott would have lower target size but also 320 HP and a pak howi would also go back to being 5 man.