There's a difference between the 2 suggestions, the biggest being capacity. If a medic has 2 bacta grenades, it's very helpful 2 times. It gives them a boost, but it's not so overpowered that it outclasses everything else.
I think giving every base battalion medic job a few bacta grenades would be a really good way to encourage using base battalion jobs without nerfing subunits, and limiting the number of grenades to 2 or 3 doesn't make the medic OP.
Not a fan of only giving them to 41st though, if this gets implemented I'd like to see every battalion get them.