Have you tryed to train a SA with a 30 aged player? xD
Here too we could add a differance between SAs, like the positional specialities, and the skill abilities... 1st group, wall, aerial defender... playmaker... and 2nd group, FK/PK/corner specialists... despite that, I don't see so badly the idea to include the aerial ability for STs in the same essence than the FK/PK/corner specialists... like a speciality for 1-who assists or pick 2-who is assisted.... in that sense a aerial abilkity ST scorer that takes advantadge of corners of FKs is not so irreal....
Despite all, looking the whole idea, there's margin as we can see, if we talk about ages, SAs , positions or re-distribution