That is a very good point, however, I am aware of it and I did not purchase the Linux version(s). Why? Well all the four games were sold very cheap via Steam, and what is more, I learned of the Linux versions after buying them (or around the same time, either way, they were very, very cheap). :] I might buy the Linux versions in the future, but that is not the point of this thread, at all. ^^ Thank you for the reply. Also, since editing is disabled, I shall mention here that one other change that can be problematic and occurred recently was the move from libpng 1.4 to 1.5.
