A few years ago I was surprised by just how many large companies build prototypes in Keynote. Sure Keynote is a great tool with lots of power, and yeah most of the prototyping tools I’d tried were cumbersome at best, but it was still surprising.
But as prototypes become much more of a requirement and less of a “nice to have” a couple of tools have come up to fill the void. I continue to be under-impressed with most Adobe offerings. It seems like every 6 months they release a new product to do this sort of work, but after 20 years of hearing Adobe has solved it I honestly have NO faith they ever will.
That being said, it seems like Framer is a pretty powerful and viable tool.
If you want to mock up a product, you should definitely check it out.