Quote from BluestrikeYes conc/grenadejumps were engine bugs as far as I know, the developers never tought to use it as a jump boost. Just like the gravgun jumping thats used by those poeple playing hl2 in a hour.
Come off it, they expected people to jump on grenades just as much as they expected them to jump on rockets. They didn't expect you to be able to stay in the air indefinately so long as you had grenades and be able to hold one and double your velocity if lag was kind to you.
But yes, this conversation is done to death and either way, grenades are gone. But grenades in TFC were not "engine bugs," "just spam" or "the shields from CS."