I think it is easy to make the case that medical facilities varied between different armed forces in WW2 and that there were good strategic and technical reasons why this was so. The biggest problem with the existing hospital company as that it is all or nothing and if you decide to have them progressive technology simply makes them better and better. The initial cost of the unit makes divisions bigger and hence increases casualties. This downgrades the initial value of 1936 hospitals. I think 1945 hospital companies are well worth having but it is kind of irrelevant by that stage.
I would have suggested one of the following would be a better implementation.
Two possible approaches which are roughly similar.
Have a reduced cost for hospital companies and then have each tech increase the cost (more manpower, support equipment, trucks). This smooths out the initial bump.
OR
Just factor them into divisions and have the tech apply to all units AND add costs to all units. Base medical provision might be something like add 2% to all unit manpower, for example. This would be harder as it isn't obvious how to factor in the equipment.
For further consideration, on a 10,000 man division hospitals and the techs have interesting effects
Initial add reduces casualties by 15% and exp loss by 10%
Success techs are loss reduction of 15%, 12.5%, 14.2%, 16.6% - these values differ from the %age listed in tech because I am expressing the multiplicative effect and the tech is additive. There are similar escalating numbers for exp retention, each successive 10% is more valuable than the previous one.