Well, the answer might not be as easy as it seems.
Indeed, making the button as a "don't remind me" option is the right solution if we consider that people can only be 100% for or 100% against the proposal.
In this case, clicking pass means "I don't care" and we can consider that this person will be fine with either outcome.
However, that becomes more complex if we want the governance system to take in account other answers that 100% yes or no. It makes sense because proposals can be long, complex and involve multiple components. Therefore, someone can have mixed feelings about the proposal and not wanting it to pass entirely while at the same time not wanting that all ideas in it become forever classified as "rejected by the community". In this case, allowing a "Pass" option and taking it in account can lead to a follow up vote.
For example, above a certain percentage of "Pass" vote, we can decide to launch a discussion thread and then rewrite one or multiple proposals that can be variations of the original proposal, or a simplification.
While it is possible at now to rewrite a different proposal right after one has been rejected, people might vote no by default arguing that this has already been rejected. Using a Pass option makes it clear that a 2nd version of the proposal is required.
Overall, it makes things slower but more accurate. But this is only needed if we think the governance system should allow more answers that simply yes and no. This is really a choice about what kind of governance philosophy we want ^^
I understand your point. However, I think making the pass button as "remind me later" button can be more confusing. I mean, if you wanted to be reminded later, just close the notification.
Also, I am thinking of this in a government election standpoint. You can choose a candidate that you want (meaning you vote a yes for them and no for others) or just don't vote at all.
So, in this proposal, You actually have 4 choices: Agree, disagree, pass (I don't care. Don't remind me for this one) and ignore (not a button. Just literally close or ignore the notification so you will be reminded of it again on your next login)
The pass button is just that. It's a pass for this proposal. Like you said, either the voter don't care and/or fine either way.
I do agree on making this more accurate so I think a comment section would be good on all agree, disagree and pass votes. So, even if you pass, you have the option of expressing why you are okay either eay or don't care or if you have suggestion. Of course, comments will be optional.
I think rather than making this complicated for the sake of accuracy is bad because it would be confusing for most. So, it would be better if everything is literally what it's meaning. "I click on the pass button because I want to pass. No hidden meaning behind it."
I might be wrong but I believe making this simple is better overall.