Hello Garry,
In the past the 4TB was big enough as I used P3dv3, 4 and 5 the last few years.
Before P3d I had stored a lot of FSX stuff. Most of that I already deleted.
With my new Flightsim PC I want to give more sim plattforms a try.
I have already installed DCS, want to take a look into X-Plane and AeroflyFS, as all these plattforms offer good helicopter Flightmodels.
MSFS not yet, but maybe in the future with VR and helicopter supported, I‘d give it a chance.
In the past I also tended to collect tons of freeware addons from different websites. Most of this I did never install....So I changed my behaviour and reduced downloading addons drastically.
Also newer PC technology has effects on the quality of scenery Addons with better textures resolution etc. resulting in a rise of data to be stored.....
Maybe MSFS with it‘s leads to a new trend, but third party addons payware or freeware will be developped anyway I guess.