At this point my PC libary has become too much to handle. I was wondering if we could add Steam, Origin, gog (good old games) and the epic game store as platforms. I think this would help, at least for me to organize my PC games.
Thanks for reading

This can already be done. When you are adding to you collection, after picking PC / Windows as the platform, choose Digital as the format. Then select a provider from the drop down (Steam, Origin, GOG, etc). You can filter by Format on your collection screen, say to see all Origin digital titles.