This seems great to me, but does this make the ballot more confusing? That's a large list of candidates, no?
The reasoning is that voters would know the communal candidates a lot better, so having more choice there would be an informed decision.
Seats are distributed to party lists according to their vote share, and then within a party list according to the individual vote amounts.
And you just write the candidate number on the ballot (see e.g. photo in this news article: https://yle.fi/uutiset/osasto/news/yle_news_explains_voting_...), so it is quite simple. The voting booth has a list of candidate numbers if you don't know yours.
We had a couple corrupt parties convince inexperienced people that were wildly popular to run for them, these people (for example one guy is a circus clown that wrote some music that went viral) then get massive amounts of votes, and drag with them to the parliament all the corrupt politicians.
They are recycled, so no waste. (The politicans are often recycled too, some having 4-5 party affiliations in their CV.)