Good point - I didn't realize that the new majorities are more narrow than they were in 2017 - but my observation is that he has more
control now over these more narrow majorities. In 2017, there were still a lot of "Never Trump" or at least "old establishment" Republicans, and the party had its own brand and ideology that was distinct from Trump. That no longer seems to be the case. And the degree to which he can deploy an angry mob against any Republican that stands up to him, threatening primary challenges or worse, seems totally unprecedented to me.
I say this as a registered Republican since the Bush era who has never voted for Trump. I don't feel like anyone in the party represents me anymore.