Those 3 states are huge, but the other swing states are definitely still a factor. If Harris wins all 3 Blue Wall states, she very likely will win the presidency. However, if she doesn’t win all 3, then either candidate’s victory will likely be decided by the other swing states - Arizona, Nevada, North Carolina, and Georgia.
FL also has recreational weed and abortion rights on their ballot this election. I’m not necessarily holding my breath, but those could help push their left-leaning voter turnout.