This is a generalized argument to be worried about anything, though. They did it before and then decided against it? Well, they could go back to doing it again! They've never done it? Well, they could decide to start doing it tomorrow!

More seriously, the fact that Apple previously implemented something and then removed that implementation gives us multiple pieces of information: they are technically capable of implementing it (not a huge surprise), at one point they thought that it was a good idea to implement it, at a later point they thought that it was not a good idea to implement it, they're willing to backtrack on implementation decisions in certain situations, etc... Depending on how you weight these different pieces of information, you can reach different conclusions about how likely reimplementation is in the future.