[Suggestion] So now LA is more better than HA in killing vehicles

No more 2 C4 killing an MBT either

Although I expect that as usual no one will be actually using it. Because why use one of the half a dozen counters already in existance if you can just complain and hope you get some free protection against one of the few infantry AV weapons that are actually effective in some way? If only effective against targets that didn't spot the LA until it was already placing it's explosives...

I think 2 bricks and a single rocklet mag still kills mbts anyway so the defence slot is useless.

You mean that instead of the percieved "instant" death you have several seconds extra to act against the LA, foiling a lot of attempts of LA as they are shot or you might be out if good range of the Rocklet Rifle, surviving the attack is useless?
You're getting a boon and you're still complaining.

Oh FFS OP..... I come to the official forum for the first time in months hoping this drivel has stopped!

People STILL talking ****!

How are you out of rocklet range if they are putting c4 on you lol? Unless you're talking about flight ceiling drops but those are pretty rare.
At best I get to get out of a tank or whatever but the tank is still dead and now there is an LA who can hip-fire just fine while flying aiming his carbine at me.

Flight ceiling drops are now impossible, and if you got caught in those you kindbof deserved it. The C4 can easily get bugged and takes way too long to drop, so basically you sat still for a minute.
Still, dropping C4 can mean the tank starts dtiving or you're still some distance in the air, removing you from Rocklet Rifle distance. Also, the detonation of C4 can quite often be a close call between destroying the tank or being killed just before. If you now also have to use the Rocklet Rifle, there will be a great many situations where theLA will be unsuccessful.
Truly, it doesn't matter what you think. The armour will reduce the deaths to an LA significantly, giving more opportunities for tanks to mindlessly camp, which are by far the easiest targets.

Finally, I used to put down C4 on a path that the tank might take or places where they might stand still. That tactic oftrn removes you quite far from the C4.

Why would it be useless?

First of all, the slot does more than reduce C4 damage. It also reduces damage from other sources.
Second of all, if an LA is going to drop 2 C4 he's rarely going to be thinking that the target will survive. So it buys you time.
Thirdly, if you don't just rely solely on a single equippable ability and say "now I'm immuuuune!", then you are going to have much more out of this slot. For example just placing a Spitfire behind you will almost guarantee your survival. The LA will need to place 2 C4 and detonate them when you've already been warned by the Spitfire (or by the explosion if the LA managed to fly 50m above you and detonates before he comes in range of the Spitfire). Then he still has to swoop down and hit you in the rear with his Rocklets, all his Rocklets. Missing one or two will instantly mean you failed. If the vehicle immediately starts moving it reduces the chance of a magdump being successful, and if you land on the side of the tank you are already going to fail the kill.
Or use one of the other half a dozen methods to protect yourself. Don't tunnelvision, use proxy radars, park somewhere where allies will do automatic sweeps of the surroundings that you can't be bothered to do yourself, move about once in a while to make yourself less of a target etc etc. In combination with the flanking armor this is going to increase your survival immensely.

Shoot down the galaxy before it gets to target.