Also in the other side, Apple deprecated Carbon, back in 2012..... and its still works, but will howover soon remove after 10.14 throught (since no 32bit support). About 6-7 years after.
So there can still been some years, before its finally got removed (or by requirement), so there is no reason to not support it as long its works, despite deprecated.
MacOS10.14 is also the last 32bit support as well. here its a very diffrent issue. But iOS64 bit does work, so its should not really been a big issue (other we also need to move the project as a xCode project rather than using costume compilers).
Same with Android. SDK Manager got deprecated as well, but as im wrote we can relocate the path used by Android Studio and simply use from there.
Also we do use few deprecated features in glbasic, im still yet to get removed. One of them is in a Audio Driver file, that got deprecated since iOS8, but still works (me thinks). But im do have no clue what that function really does, if used at all.