Except, the Daisy can hover, and can be called an All-Terrain Vehicle.
What I am referring to is slippage. One cannot simply protect from the top, and cover the bottom. If you introduce a surface to ice, you'll gain slippage as a result to no grip, or due to it being 'slick'. You need friction and grip. A shield would introduce this into the tank equation and create a danger.
Example 1: You've mentioned Directional Shields. If you come under attack, you put up the shield to cover one direction. However, if you drive over a mine, your bottom explodes, destroying treads, and the lower plate, and likely the engine housing. If you cover the bottom, you risk still blowing your treads, if it covers both, you risk slippage, throwing off possibly critical shots in a fire fight situation.
Example 2: You're under attack once more, except from multiple sides. Your tank is protected, however, if you're in motion, ground based obstacles provide a challenge, and threat to your tank still. Deploy a full shield, movement is decreased due to lack of traction, grip, and friction. You'd lose control. Wet soap sliding across a surface for example. Or, you risk burning the ground out from under you. As I recall, the shields the YSE uses cause significant harm to anything they touch.
This isn't an example, but a mention to my above post's edit.
Soresu said:
EDIT: If I could recall how expensive it was, I would've suggested a Yarvex weave inbetween plates instead. It would help with kinetic penetration, and leave the main bulk of the plate to take the pounding. We're also dealing with a regenerative armor as well, making it incredibly durable and resilient as is.
Could say, if it had this weave, - 2 vs Kinetic Penetration or something. Or simply bump up the hull SP to compensate.