The devs will never please everyone with things like this. However, most people don't care about the sorting.
If people care that much, they should use LSSM (should use it anyway), and use the ECW setting to customise and create own categories there.
Plus, most people use ARRs anyway, so don't look at the mission list.
Y'all blew this up, and threatening to not support the game anymore is just, quite frankly, an over reaction. I'd rather devs focus on adding content, creating features etc., then going back and forth satisfying people on where vehicles should be. Use LSSM/ARRs, simple.
In fact, you already stated in the LSSM Discord that you already use the custom categories to move the rescue pumps, so again, are just over reacting for exactly zero reason.