I do this often, and over time. I've noticed quite a bit of digital pack rat genetics in myself, not just related to Anki but data in general. Over this December holiday I reindexed and cleared out over 16 years of digital projects, I was amazed at the amount of things I thought I'd have use for again at some point.

What was however fun, was seeing how I've grown as a programmer and developer.

With Anki, I do it gladly, every note deleted with no practical value, saves me first the cognitive overhead and stress of review and second all those wasted little future times. With things like Coursera material, I've found that some information loses it value for me over time, so I might keep a personal note deck then, but export it, if I wanted to glance over it in future.