Everyone uses Scott rn because they don’t have access to other mobile arty non-doc. None going for calliope or priest will use scotts consistently because you are painfully vulnerable to tanks.
The scott is not even close to the same role as the Calliope or Priest. What are you talking about? Literally the only thing they have in common is the word artillery. After that the units aren't even remotely similar
Calliope is good against blobs, priest is good against team weapons/structures, scott is all-purpose anti-infantry. You pick the one you need, you don't get both of them unless your opponent is allergic to building vehicles...
Your tanks will not mop the floor with anything because there is a thing called Jackson that keeps USF up with AT game. A pak howi calliope jackson turtle is the only usf meta you’ll ever see.
If they are camping and relying on artillery, you should easily be able to outnumber their tanks... If you can't fight 1 jackson I don't know what to tell you
For some reason you think choosing a scott makes you too vulnerable to tanks, but camping with a pak howy and a Calliope is somehow an ironclad defense against anything...