What do you think of fantasy creep?

Basically, the addition of more fantastical elements over time in a world that didn't have anything similar before, like the ideas version of power creep. That's the best I can explain it. I saw the term once and I don't see it anywhere in this subreddit. What do you think of this concept? Has it occurred in your world? Can it be a good thing if done well? A bad thing causing inconsistency? Should it be avoided or is there potential in using it?

My world started with me wanting to try scientific plausibility in terms of biology and technology, but now I have a lot of ideas like dragons, underwater sapient anthros, magitech and possibly magic being given by deities. This is for a world that combines the ancient world (pre 500AD mostly) with modern technology as the main concept. The closest existing name I found would be bronzepunk.