At the moment I try to concentrate on certain topics and sell / swap other figures to finance the key-projects. Concerning the 18th century Culloden is one of my favourites and those figures will always stay. Apart from that I only want to work on 1732 and 1771 in the future. I really like the shape of the coat and I think it does not only work for officers. Ranks also wore coats with tails and the "older" printed torsos from playmobil always looked like short jackets to me (better suited for Napoleonic times or later).
Ah, I see... I was under the (wrong) impression you kept all or most of the custom-figures you make, sometimes only updating them with newer parts or accessories.
I´ve also thought about using the longcoats for lower ranks / foot-soldiers, but have decided not to do so, with a few exceptions.
I often like to equip lower ranks with white cross-belts, and sofar there is not such a "fat" one that can fit over the coats.
The printed coats on older torsos may indeed sometimes (tend to) look a bit "short" now, but I can live with that. To me, most of the non-longcoat post-2000 soldiers - or customs based on them- still have a lot of charm and fit good enough among the newer ones with longcoats. It would also be too expensive to re-equip all my soldier-units with longcoat-wearing ones. Additionally often the older torsos aren´t suited for use under the longcoats. And also, I bought a lot less white cook-torsos then you did.

So, personally I keep the older soldier units (sometimes a bit updated with other or newer accessories) and add officers with longcoats to them. I did do one 40 man strong cavalry-unit all equipped with longcoats though.