Apparently some things were change when creating the SS god mode for Vegeta/Son..
The original 10-12 jury members of the DB saga created Vegeta/Son in the god mode they were suppose to have before the change..
(Son Gohan Beyond Mystic)
Gohan's mode may still be in the cards if other arcs are to come for the series..
I think the design of their god modes changed because they wanted/needed to make a clear distinction between what gods should look like compared to mortals..
Even the kaioshins have different designs compared to G O D Angels GP & Omni-King so it does fit abit better to have them as mortals with god ki an not classified Gods...
The original 10-12 jury members of the DB saga created Vegeta/Son in the god mode they were suppose to have before the change..
(Son SS God Mode)
(King Vegeta SS God Mode)
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(King Vegeta SS God Mode)
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Also
(Mystic Son Gohan)
Gohan was also changed to side character from being the MC of Super.. He was also going to have a different form along the sage, beyond Mystic..(Mystic Son Gohan)
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(Son Gohan Beyond Mystic)
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Gohan's mode may still be in the cards if other arcs are to come for the series..
The images are of original design by the 12 jury members of DBS an not fan made, though they were dub fan art after the changes were made..
I think the design of their god modes changed because they wanted/needed to make a clear distinction between what gods should look like compared to mortals..
Even the kaioshins have different designs compared to G O D Angels GP & Omni-King so it does fit abit better to have them as mortals with god ki an not classified Gods...