Don't want to duel here so will try to keep it sort. Difference between FA and Ostheer bunkers are not that great an I do not think that assault IS spam is that viable, in addition it doctrinal issue that should dictate the addition of stock unit.
Think we can all agree that UKF have sufficient healing options even without the medic sqaud.
Think we can all agree that IS simply have too much utility with cashes/spotting/healing/sandbags/trenches.
It is my opinion that some of that utility could and should be move RO.E. especially if they are moved to T0.
That might include some building staff but could also include upgrades like heal and Pyro. Then balancing IS would become allot easier.
The difference really isnt insignificant. You can build a bunker from minute 0, you can't do the same with an FA, and it is indeed more expensive. If that was the UKF's only medical device then they would be undeniably shafted in terms of medical availability. There's not much to say against this. The simplest solutions would really just be to give UKF base medics, or, as i suggested previously, allow them to build FA for the price of a Bunker, at the timing of a bunker. (And later be upgradeable to a "real" FA for tech/utility purposes)
IS are overburdened, and this has clearly caused some balance issues for UKF. Replacing Medical Sections with some alternative "Combat" upgrade would be ideal, as would moving Trenches to RoyEs.
I can't get behind moving Sandbags to RoyEs, however, unless they became the starting unit. All other factions either have their builder unit making sandbags (While also having them as the default unit, allowing them to immediately go and start setting up), or they have their mainlines produce sandbags, so later availability isnt as meaningful, due to the fact you will have ~4 squads being able to throw them up.
Shuffling abilities between RE and IS would be nice, but it would need a fair amount of consideration. I still think the Officer should be made the standard unit, given rifles, and various upgrades/utility abilities, incidentally. The Officer could even then be made to be the unit with the medical upgrade, somewhat like the Commissar.