You just contradicted yourself. If it's "let people make their own decisions" -- then it's not a requirement.
And if it becomes purely totally optional, that totally contradicts your earlier point about an incentive to get the vaccine.
Right now -- Grrrr.... they are saying I can't take off my mask unless I get a vaccine, along with most other people.
Your proposal -- Woohoo! I don't have to wear a mask anymore, whether I get a vaccine or not!!!!
Yet, it's the anti-vaxxers, anti-maskers, those who have been against every restriction all along -- those are the people who seem to be making the most noise about "putting up with the same restrictions!"
In fact, for responsible citizens, the restrictions are now totally different -- If you're vaccinated, you can have small gatherings indoors without masks, with other vaccinated households. If you're vaccinated, you can now have smallish gatherings outdoors without masks.
So reality is, for those that actually have been following the rules and recommendations -- It no longer is the same restrictions. For those that have followed the recommendations and now have gotten vaccinated, the restrictions are dramatically different!
The rules only seem the "same" for those that have been minimally compliant and have refused to follow the rules the most.