
Ji-N:
People drop shows early, and that feedback is still valuable. Removing it biases reviews toward only fans who finish, making ratings less trustworthy.
On-going and dropped reviews are not really the same, personally I have no issue with dropped reviews. We could still have dropped reviews exists, but be available to view by users only after the show ends airing. One can write it when they drop it, but the review section being open to be viewed only after show finishes airing.

Ji-N:
It also doesn’t work for long-running or ongoing shows. Expecting users to wait months or years kills engagement and discussion when interest is highest.
I think reviews is not the place to talk about how people feel about currently watching shows, we have many other spaces on mdl for that: comment section, forum, feeds, episode reviews. There are many places for the "engagement" to happen even outside of the review section. If people want to figure out how the show is going when it airs, they can check these places, and when they want to find out how the drama is overall after it finishes airing, that's where they check reviews. But if reviews are "free to write whenever and whatever you want" then there is not real place to find actual reviews.
I don't think anyone here expect spam reviews to stop existing, it's impossible, but we do feel like not much has been done to make them less prevalent and to make it harder for people to write them.
And I totally understand that for the website it's better to have more engagement and more reviews - that's how websites grow. But there needs to be a balance between trying to get more quantity without ruining quality, and for the past few years I feel like quantity was prioritized.
The same way some restrictions has been placed on who and how can write articles, something can be done with reviews. Obviously not to that extent, reviews overall are supposed to be open for everyone to write.