I’d argue polling access is what led to lower turn out. Someone would need to do the analysis but a lot of areas became more restrictive
List of laws to restrict or enhance early voting
https://www.brennancenter.org/our-wo...september-2024
Since the 2013 Supreme Court ruling softening the voting rights act 1 in 5 polling locations have closed
https://abcnews.go.com/US/protecting...y?id=114990347
Relative to 2020 it was more difficult to vote.
If you look at Michigan total number of votes increased. They expanded early voting options.
But keep in mind that only about 92% of the vote has been counted so the actual difference is only about 2 million out of 154 million votes.