Hi

You're right, I should have spoken to the community about reducing the size. I was simply in the flow. Originally, I only specified that the tennis courts were too big. In my overpass query, however, the already mapped tennis courts also came up. I'd be happy to bring this part into the community. I see this point clearly, as it is a massive change to the data.

Nevertheless, I would like to refer to the wiki, which says at https://wiki.openstreetmap.org/wiki/Tag:leisure%3Dpitch:
"If there is some physical outline of the pitch or painted line markings...".
I see your point that especially in tennis not only the markings are used, however the markings define the pitch. What we map as leisure=pitch.

If you think about the picture further, football pitches should not be mapped at the markings, but about 50 cm further out, since the player is no longer on the pitch when the ball is thrown in.
And to stay with football, is the goal part of the pitch or not?

A consistent mapping of the pitches makes it possible to make more accurate estimates of the number of pitches based on the areas, if people are interested in areas.

I would like to take the topic of tennis even further and consider drawing an area with leisure=sports_centre around the individual pitches.

Cheers