Seit 4 Jahren steht der "Name" da jetzt schon drinnen... mag das aus der Gegend bitte man checken?

There are two objects with "leisure"="picnic_site" in the vicinity. This tag is deprecated. If you know the place please consider changing it, e.g., to leisure=picnic_table if it is just a table or tourism=picnic_site if there are some additional facilities like waste baskets etc. (see tourism=picnic_site for more details)

If the routes at https://harmanliikenne.fi/en/seinajoki-local-traffic/route-map/ are still correct (and I don't doubt that) then there are quite some local bus routes missing:
2, 3, 6, 7 (1/5 are partly wrong - there is a 7 serving Eskoo instead of 1 and 5 is not going to Karki), 8, 10, 11
Or put otherwise, only a very few are somewhat correct and complete. I know how hard PT mapping is (or anything related to relations that often get butchered by other users for that matter) but it is so immensely helpful if you can rely on it... good luck :)

holy WU-studenten-vorurteil-bestätigung galore... https://overpass-turbo.eu/s/WY7

Sollte das nicht ein leisure=picnic_table sein? oder zumindest tourism=picnic_site (leisure=picnic_site ist ein veralteter tag).