The DEMAND must always be for the full measure of rights. Just google Martin Luther King Jr quotes for the "Tranquilizing drug of gradualism" and his conclusion:

"This is no time to engage in the luxury of cooling off or to take the tranquilizing drug of gradualism. Now is the time to make real the promises of democracy."

MLK: "‘Wait’ has almost always meant ‘Never.’"

Half a right, like every other day off from torture, is NO RIGHT AT ALL. Half a right, an incremental gain in non-torture, is just a continuing violation, IF the right is Fundamental (the key distinction of the OP)

The GAINS may sometimes be "incremental" or claimed to be incremental progress (even if not at all progress) because they are only grudgingly given up by the status quo.

But make no mistake, DEMANDS for incremental gains on fundamental rights like voting are ethically, politically and even TACTICALLY highly mistaken, self-defeating and wrong, because it's wrong to ADVOCATE publicly in favor of injustice. Only with public regret and caveats can such be accepted, and even then only if it's not a fundamental right like voting, voting systems, torture, etc.

Even teenagers know to ask for the car for the whole night or weekend and then "compromise" UNDER PROTEST AND COMPLAINT with an agreement for 3 hours on Friday night. Even teenagers don't PUBLICLY (in front of parents) celebrate or approve such "incremental" wins. Possibly, they may privately amongst themselves still have a great time and be happy they can get out just a little, but they'll be back for more.

And they'll be UNDERSTANDABLY back for more. FREEDOM and the yearning for it, even if at too young an age, is human, necessary, and should never be shackled in chains.