The pineapples opened up a whole other window of opportunity for cap routes. I remember Falcon would easily get half way across the map when he was using outrider and if he did his route correctly, so of course keep the pineapples!
And this is exactly what I think the problem was with them. In my opinion, I think they changed the basic structure of Legions movement by allowing absurd, almost instant jumps in velocity (speed and direction) both on the ground and in the air. Specifically I could get across Zenith in just one jump by "shank jumping", changing the overall flow of the map and the game. While yes, there was quite a large health trade-off, the boost that it gave was overpowered.
As a solution to this problem I would tone down the knockback effect of both singular pineapples and "shanks". Pineapples alone became way to much of an effective and moderately spammable source of AoE knockback used to throw off cappers or wreak havoc in an enemy base. Towards the latest build on the NanuNanu and LP servers these problems were beginning to be addressed, but I think it needs to go a little further with the nerfing of pineapples, especially in knockback (both amount and radius). After all, it is clearly support weapon as it can be fired at the same time as the general (main) weapons.