Thanks Dave. I will go ahead and try to put the mods back on, as I have no interest in uploading photos etc.
It's unfortunate... really I was about to swallow the toad and slowly rebuild my TSW collection on steam sales, as you don't get a aquedate TSW experience on Xbox anymore. Hope they can lift some of the restrictions for certain type of mods.
The current reason for this is said to be UGC content being uploaded and downloaded. Since Mastery works differently, it will not affected by that reason per se. However, other question is how long it will not affect mastery. Concerns were raised in this thread that it could be used for some kind of cheating and that is a whole different topic, which might add to the problem negatively. I was surprised to hear that as well. My assumption is that however it is not intentional (neither by DTG nor the one who uploads the creation) that the upload is impacted by an installed mod or modded data is getting uploaded along with the "pure upload". It seems to accidentally cause the upload to be some kind of malfunctional or altered. Maybe DTG can't detect a malfunctional upload (maybe they don't even know which mods are causing it and what exactly they are causing), so simply disabling content from being uploaded when unoriginal paks (mods) are located in the DLC folder seems to be a simple workaround (at least as a temporary solution for this point in time).
Yes, I heard of many people who come from consoles to PC, just to be able to use mods. This also will have an impact to those loyal customers who even are willing to purchase the same DLCs twice to be able to get the modded experience on PC with timetables, patches and other enhancements.
There is a mod manager, on Train Sim Community. I use it all the time to turn off route EPs that seem to conflict with other route EPs.
https://www.trainsimcommunity.com/mods/c3-train-sim-world/c75-utilities/i1093-tsw-mod-manager-221 Didn't tried that before. This is a very cool tool and does the things I described yes. I think it even solves our current problem here. When deactiving a mod, a folder called "ModManagerDeactivedMods" is created inside of the DLC folder in which the paks for all deactivated mods will be transferred. The game seems to not load the mods thereafter. Can't confirm whether uploading works though as I currently can't login to DTL. But if it works (the game doesn't recognise the paks when being in this auxiliary folder), this mod manager might be the solution to not needing to manually move the paks out of the DLC folder if you want to upload creations to DTL/CC. The only problem is it seems that you have to run this application and deactivate the mods before running TSW still. Would still be nice to be able to do that within the game.