WordPress does this sort of thing, or at least can (I don’t know, I’ve only ever been involved with a couple of WordPress sites). It’s obnoxiously awful. You end up with people accidentally relying on non-canonical URLs that subsequently change in meaning, or using links that seem to work but actually give the wrong content and you don’t notice. Both of these are very often much worse than a 404. There’s also an issue where articles can become inaccessible from their correct URLs, due to something else taking precedence in some way; I wouldn’t say that’s fundamental to the technique, but I do think that the philosophy encourages system designs where this can happen. (Then again… it’s WordPress, which is just all-round awful, technically; maybe I shouldn’t blame the philosophy.)

So no, please don’t ever do this.

But what you can do is provide a useful 404 page. Say “there’s no page at this URL, but maybe you meant _____?” Although there’s a strong custom of 404 pages being useless static fluff, you are actually allowed to make useful 404 pages. Just leave it as a 404, not a 3xx.

(Also, care about your URLs and make sure that any URL that ever worked continues to work, if the content or an analogue still exists at all. Distressingly few people even attempt this seriously, when making major changes to a site.)