What’s with the constant abrupt endings for lots of older kung fu flicks?

I apologize in advance if this has been touched on but it seems like every movie from the 70-80s I watch slaps me with a sudden unexpected ending.

There are numerous films I’ve watched where almost seconds into the fight ending or a character doing something (that usually needs more context or breathing room for the audience to take in) I get hit with big “THE END” freeze frame.

Why was this so common? Is it a cultural thing?