You bring up an excellent point. Light bots best defense is not to get shot at in the first place.
Boiled down, I disagree that adding the stabilizer module to the game is going to make light bots useless. If the stabilzer created a 100% chance to hit light bots with med weapons, or 100% damage from missles, to where mechs would always 1-shot light bots, then I would agree.
I don't think this module was introduced to make light bots obsolete and I don't think it will have that effect in practice.
I think it depends on what it boils down to. Maybe it wont be worth it to put on a mech to hit a light like was brought up, but I think it will be -- espically if you know your enemy will be in lights. Besides, 1 of these in a small mech gang for anti-tackle?
I can also see that you don't have alot of experience fighting in light bots against mechs. Good percesion firing skills destroys light bots as it is now. Ask the dom crew. Their tacklers are getting destroyed trying to tackle. Ewar bots getting 1 shot by a kain if 3 of 4 guns hit. This is where tatics are invovled, and using terrain. If you catch a mech in the right spot, with the right stuff he's screwed.
Now enters this module... it has the possibility of making light bot warfare next to obsolete... when your enemy knows you're going to use them in a defense situation. On a roam, you fit one mech out with it to be anti tackle/light bots. Maybe that's the intention. Make mechs the main choice for pvp. They're more expensive, but going to be easier to get. Maybe now kains or ew mechs will be the new tackle. Maybe the next move is to rename the game Mechs Online.
Thankfully you light bot guys get a free respec though right?