why isn't TextScript.Y-offset set in define-grobs.scm?

[Joe Neeman]

I could have sworn I sent this last night, but it isn't in my "sent"
folder. Apologies if people get this twice.

It seems that every time a TextScript is created, it is sent to
Side_position_interface::set_axis (Y_AXIS). Is there a reason that we
don't just set Y-offset and side-axis in define-grobs.scm? Same applies
to Script.