Hi all, thank you 'TheRomanRuler' for this interesting OP.
For me, home garrison was always closer related to immersion (e.g. German Ersatzheer , UK Territorial Army, US Army Ground Forces) than towards any practical in game benefits.
Fortunately, with the new Army Planner system of HOI4 this kind of system will become much easier and more beneficial while giving you even a greater degree of immersion.
New divisions are now created with the Army Planner and can be kept off map for some time for the basic training and on map for some unit training, in order to improve their overall unit XP. While these troops get polished for front line service and await the completion of the ToE, they also give you handy reserve that you can use as a global impromptu reaction force. So, while you expand your ground forces you can use these green troops as a garrison for the vital parts (ports, capital, etc.) of your country.
As we have seen in several WWW sessions, the new logistic system will be even more unforgiving if you push all your troops into the spear tip of your logistic sword (lit.). Therefore it will be quite useful to withdraw some troops for R&R into your hinterland, maybe even all the way back to your home country. This would give you further ad-hoc reserves.
For me, home garrison was always closer related to immersion (e.g. German Ersatzheer , UK Territorial Army, US Army Ground Forces) than towards any practical in game benefits.
Fortunately, with the new Army Planner system of HOI4 this kind of system will become much easier and more beneficial while giving you even a greater degree of immersion.
New divisions are now created with the Army Planner and can be kept off map for some time for the basic training and on map for some unit training, in order to improve their overall unit XP. While these troops get polished for front line service and await the completion of the ToE, they also give you handy reserve that you can use as a global impromptu reaction force. So, while you expand your ground forces you can use these green troops as a garrison for the vital parts (ports, capital, etc.) of your country.
As we have seen in several WWW sessions, the new logistic system will be even more unforgiving if you push all your troops into the spear tip of your logistic sword (lit.). Therefore it will be quite useful to withdraw some troops for R&R into your hinterland, maybe even all the way back to your home country. This would give you further ad-hoc reserves.