From another perspective, Harris's "If Congress does not enact my agenda, I WILL enact it through imperial fiat executive order" campaign promise is not a reassuring thing when one of the biggest problems with the country is the President having too much power.
I don't exactly disagree with you,* but most of the actual problem there isn't the president having too much power per se, it's congress repeatedly abrogating
its responsibilities and powers. The presidency being as strong as it has been for the last while has less to do with it gaining new powers and more with congress not exercising it's own. That sort of campaign promise is functionally toothless if congress gets off its collective arse.
Now, if you're expecting congress to continue to just sorta' sit and spin on some subjects (say the GOP keeps the senate, which isn't exactly an impossibility) and refuse to galvanize or fight back against presidential overreach
(again), well...
* Though that said, on some subjects it might could be stood if congress isn't going to do its goddamn job. Climate change is absolutely a national and damnably time sensitive emergency, just as a single example. Slopes are slippery and knock-on effects est, but we're running out of time to keep fucking around.