I agree with you actually, mostly.
These are quite same and hardly any difference.
Why cant we write to’ta with tey ? does it make any difference in sound with Toeyn ? no
Similarly any person who has not seen few words written cant guess its spelling
Do you know how Asteefa is written in urdu ? :rotato:
It is
Alif
Seen
tey
Fey
choti ye
khara zabar