Because Democrats certainly don't think so. Tell them what they are doing is unconstitutional, they will say yo momma is unconstitutional.
I'm increasingly of the opinion that the topic of the Electoral College is now a dead horse, occasionally beaten to give the impression that constitutional safeguards are still in place. If the idea is to put the high-population voting districts in Democrat-run states more directly in charge of the outcome of national elections, well, they already have that via vote fraud.
Killing the Electoral College at this late hour will only allow the left to relax and enjoy their victory. I'm sure that ballot harvesting, counterfeit ballot printing and distribution, ballot box stuffing, mail-in ballot drop logistics, fee negotiations with Dominion et al, why, it all must be such a burden. Better to just get us to surrender and accept them as the permanent ruling caste.