Sorry but this is just not true. Steam, Origin, UPlay, and just about every other gaming marketplace allows you to install the gaming library anywhere you went. Heck steam allows you to straight up and move the steam folder anywhere, delete everything but the games and the steam.exe and it will repair itself.
Steam only added the ability to store games elsewhere relatively recently. It was a long sought after feature that took ages to implement. I doubt it was really easy and just a case of no-one caring.
Yeah, I had a look back and it's been around longer than I thought. I was so used to symlinking I didn't realise the feature has existed since 2011 or 2012.
