Well I was wondering about something like . . .
You attack with a mech regiment (3 battalions & command company) which has 120 mechs (if at full strength) and your orders place everyone on the line. Its a RCT-type formation so you have at least two regiments of armor, a BA battalion and a regiment of infantry involved in the attack. So 216-240 vehicles, 36 BA suits, and 750-ish infantry involved in the attack with the mechs. To sort of scale it . . . 12 mechs, 22-24 vehicles, 4 BA suits and a company of infantry, if you wanted to do a 10% representative battle.
Results of the battle for that side could be interesting . . . you could have for instance, 2 mechs mission kill (XL crit or side torso, head lost, gyro shot out, etc), a truly dead mech (CT cored), 6 destroyed tanks, 1 mission kill tank (lost turret), half the BA suits wiped out, and the infantry company loses a squad or two. Well, in the immediate aftermath your mechs have taken 25% losses, the vehicles took about 30%, BA took 50%, and infantry took 22% losses after losing 2 squads, but I would like to have a variance in its application to the whole force in the battle. Linked to their robustness IMO . . . 1% or 2% for mechs (so 23-27% depending on roll), 4%-6% on vehicles (24%-36%), etc and apply the a random result per lower level unit. So the mechs of the regiment took approx 25% losses, now each battalion and command company that was on the line will roll. Its not going to change the results for the company, they are still going to lose 3 mechs. But each battalion will lose between 8 (23% is 8.28) and 10 (27% is 9.86) mechs. Not sure how this would play in, but once the command had the time, they would get back the 'salvage' grade losses; 5-6 mechs per battalion and 1 vehicle per two vehicle companies. Infantry mission kill vs truly dead, I do not remember the rolls so that would have to be checked.
Which does not even get into personnel losses (MW, vehicle crews, BA troopers & infantry wounded vs dead) or the ability to salvage stuff from the other side . . . so the above regiment inflicts similar damage but holds the battlefield. Which means you could salvage a replacement to keep your strength up IF you pilots did not get dead. Your armor is likely hosed though, lol, since I am not sure crews survive damage wiping out internal structure in a section.