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There's a lot of variety in DP. Knowing about DP doesn't help much with solving DP problems. I'm sure you've seen all the fun problems on codeforces or leetcode hards. The one quote I remember from Erik Demaine's lecture on DP is where he comments, "How do we solve this with DP ? - With difficulty."

That's my impression as well.

I think it's because access to knowledge has become a lot easier, so contestants know more; plus, the competitions themselves have become more organized.

For example, last I checked, the IOI had a syllabus outlining the various algorithms contestants needed to know. During my time, it was more of a wild west.

That's how Competition Makes All Great Again. Looks like it's by God's design. ^_^