this is my first suggestion after several years of playing WZ.
I like the concept of combinig different propulsions in WZ, but sooner or later there is no real need for wheels and half tracks any more. At a certain time, there are often heavy but slow tracked vehicles or very fast hover units. Maybe there is a solution to change this by adding some kind of "noise" to each propulsion. This changes enemy sensor range for each unit.
wheel -> fast and very silent
half-tracked -> medium speed and silent
tracked -> slow and loud
hover -> very fast and very loud
VTOL -> even faster and even louder
If you have a silent droid, it will be harder to detect it and it vanishes faster when leaving detector range. Silence means, enemy sensor range is reduced, while a really heavy tank/VTOL/hover can be detected beyond sensor range. Maybe you can even have a noise factor or each body and weapon. In this case, a wheeled small-body droid can avoid detection even in later game
There could be some noise reduction upgrades, in order to extend WZ techtree a little
Even future naval units (I still look forward for them) could benefit from this idea. A submarine is nearly noiseless(cloaked) until it shoots or an enemy droid is close.
There has been a similar thread before, but this one was sticking to size of a droid mostly.
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