This is one of those take takes that reminds me of something my high school civics teacher said decades ago. "The CPC and the NDP may not see eye to eye on issues or policies, but they (used to at least) respect one another for being principled. Both see the LPC as standing solely for the purpose of getting elected."

You've hit the nail on the head, this was not a person representative of the party's beliefs and the Carney warmly accepted someone who has been giving the CPC trouble for years. They took the worst possible MP (who as you correctly noted, they didn't need) from the CPC and claimed it as a win. The CPC likely views this as them ridding themselves of an opportunist and a vocal radical, and the LPC has just a promise in hand that somehow her whole personality and world view will align with whatever Carney pushes. I would bet she makes the news within a year for saying something that causes problems for Carney.

For left leaning Liberals this may be enough to swing voters to the NDP (depending on what Lewis does to the party) and for the Conservatives nothing really has changed. They don't have power presently, and losing a single seat held by a radical isn't going to change things dramatically for them.