>>302677298
They have the same layout dude. The underground section on Mill is rarely used due to how much time it takes to cross and how bad the exits are. On most rounds the T's just funnel through one of the three major lanes and hope for the best. At least on Tuscan there's 2 split paths for entering B instead of one.
You're right in that it's not bad enough to remove, but imagine playing a full game on Tuscan and the map switches to Mill. I'd probably just leave on the spot.