On topic of sharing content: one thing that I thought it was really neat on GTS is how I had easy access to any kind of content. If I wanted to see liveries, race photos, scapes, suit or helmets, everything was inside that "discovery" tab. Everything in one place.
GT7 is slighty different because although they're all inside the "Showcase" menu, you need to click on the middle tab to see the different options. In GTS was more "user-friendly", since each category was already on the left panel and each of them even had a different color.
In GTS, content were always sorted as new by default and that gave us a chance to show content for anyone browsing through.
In GT7, as soon as you enter Showcase, everything you see is already trending, so there's no much reason for a person to browser photos or liveries, unless that person needs something especific. I think that's why we don't see many people browsing the race photos or scapes, because the ones with highest views are already on the "main" page.
Well, back on liveries! Question: it's still possible to port GTS liveries? I didn't shared some of my liveries because I thought it would be easy and fast to recreate them in GT7. Let's just say that's not the case anymore.