For me a significant update is easy to define, it’s something that could be presented as a new product.
I will take @intercroneswap as an example. For the season one they have presented the swap if my memory is good. For the second season they have presented analytic tools that have been integrated to the swap. I think the analytic tools could have be presented by themselves as a product. Not just like a feature. So for me that application was valid.
I don’t know if I explain properly. What I mean is that the feature, to be significant, could be presented “out of context”, not like an improvement but as a brand new product.
Edit: I should have read your comment twice. What I’m saying is pretty similar to it ^^