Give me one reason I would use Photon over Ageless.
Ageless will get more expensive than photon unless you use it the turn you draw it.
There are situations where it is better to wait to play a creature rather than just shotgun them as they come in.
These would generally involve waiting to play creatures until you draw a counter to a particular threat. E.g. SoP to avoid getting eaten by otyughs or shot down by owl's eye.
Waiting till you have a fractal to compensate for potential CC.
Also, if you put these in a non-time deck, silence would really suck!
In general though, I think you are right, this will probably overshadow photon pretty significantly
