I have to agree that there's more important things to work on, but it would be pretty cool to have them and it could definitely shake things up gameplay-wise. For example, quad mechs could be able to traverse steeper slopes, or not be slowed down as much when going over obstacles. Both would also have very high-mounted hardpoints, but the Goliath would have less places to find cover.
For the Scorpion I was thinking they could do something similar to what they did with the Nova. For anyone who doesn't know, the Nova originally looked like this:
So for the Scorpion they could simply give it a separate turret. They'd have to rework the hitboxes though, because in the Battletech TT game I guess they treated the arm hitboxes as 2 of the legs and the leg hitboxes as the other 2?
Alex Iglesias could definitely make both designs look awesome, so I wouldn't be too worried about the Goliath being a literal walking tank.
The Scorpion has 6 variants according to Sarna (1 with MASC), and 1 custom variant that could be made into a Hero mech, and the Goliath has 9 variants (1 with ECM).
PGI has also changed the hardpoints that some mechs are supposed to have, so it shouldn't be too much of a problem to give the ability for better loadouts.
And if I'm not mistaken, the only reason quad mechs weren't used as much was because they required a lot of maintenance originally, and once their technology improved there was still a stigma attached to them.