I completely agree that people will and should delegate their vote - that is the beauty of the design of the NNS. There are detailed long term proposals that have been brought forth by the community for providing an easier UX for NNS voters in terms of making sure the proposals reach a certain threshold of support before they community is mandated to vote on them in order to receive rewards. I detailed such a proposal [Proposal] Introduce an incubation period and minimum support threshold for governance proposals, and responded to this exact concern from @cryptoschindler about hundreds of proposals coming in a day here
This being said, what you bring up with the NNS being flooded with legitimate proposals (that aren’t financially motivated) is a separate voter UX problem.
There should not be a financial incentive for spamming the NNS - period.
(Or at least it should be very, very difficult to do so)
I agree with this sentiment. Auto-merging would be a big NNS UX improvement, but that’s for another discussion.
That being said, you forgetting to merge your maturity isn’t as big of a deal as missing a potentially critical vote on the IC.