The only laws I've seen you describe elsewhere in this thread is the delay in New York if you want to switch parties (was 6 months in 2016, now I believe it's up to ~11 months) and the fusion voting system. Neither of these prevents Democrats from voting in the Democratic primary, so I'm not sure which ones your talking about.
I'm not sure why you think contested races only happen once a decade. The year before the gubernatorial race, there was, (for example) a pretty well contested NYC mayoral race and NYC comptroller race. There have been plenty of contested races in the NY senate, (some connected to the IDC drama, like Tony Avella beating John Liu 6,813 to 6,245 with ~13% turnout) as well as the assembly and downballot races.