Thing is, designed or not -
a number of nations across various eras have specifically designed certain vehicles for doctrines that are very, very incompatible with fighting corner-to-corner in a claustrophobic environment.
These are tanks with very little armour (to the point some of them can die to machine gun fire!), no stabilizer (while contemporaries may have stabilizers or are stabilized through complex transmission/track designs) and practically non-existent reverse speed (it’s also a problem when peeking over hills, but usually in open maps you can relocate to a position to get the first shot unnoticed, whereas in a city map your engine sound will give you away if the enemy pays attention).
What are these tanks supposed to do? While spectacular skill can make any meme-worthy tank get top of the leaderboard, for the average player it’s a significant handi-cap for wishing to play certain nations along certain BR ranges if all they can get are corner-peeking maps.
However, you do have a point “for modes like arcade battles anyway”, given the significant differences between AB and RB ground. There’s a reason people strongly, very strongly advise playing britain at all in AB ground - markers nullify their mobility and ambush oriented gameplay and the powerful 17 pounder never gets a chance to shine. Given their paper-thin armour, I imagine japan and especially italy likewise suffer. Especially italy, with their literal jeeps that someone decided to strap an anti-tank gun onto.
edit: Doublechecked.
Yep, italy has a number of vehicles going as high as 6.7 BR that can be easily torn apart with a simple 50 cal machine gun (8-20 mm hull armour on the front)