I understand what you are saying, and I promise you that most of us work in Sprints, and "Agile" environments with living products. Just because a flow changes doesn't mean the entire interaction design isn't broken. You can add another view into the flow, or alter as needed, updating the few behaviors that need changes. We do occasionally make those rare rapid changes before implementation (even scrapping entire flows), but more often we have simpler clickthrough prototypes, and white-boarding sessions that decide flows before we ever get to adding the micro-interactions that Flinto, etc are intended to provide.

I'd also wager most of us (myself included) don't do an entire prototype flow within Flinto, ProtoPie, Principle, etc. but instead use them to show complex visual behaviors that provide callouts, direct the user, and enhance the overall experience. I can't imagine (nor would I recommend) doing an entire application flow in those tools, and would never attempt to do that.

Figma clickthroughs have been mainly what we use now, and jump into Principle (as of late) for micro-interactions, and to demonstrate to the development team how we want something to function. I've even created quick prototypes with vanilla HTML, CSS and JS.

Jan, I come from a developer perspective (35 years) and I'm crazy in love with Supernova Studio because it backs up what you do in design with full code generation. (I also have a long pedigree in code-gen having worked on the two dominant products in Classic MacOS days).

I have long despaired about how the tooling world was ever-focused on products which only got as far as generating image assets and sometimes videos for hand-over but had no brakes to bring them back to reality. Obviously, a skilled dev team can build anything but the budget often doesn't allow for it.

Supernova Studio requires you start in Sketch and their one weak point at this time is re-importing a single screen loses some details, but it's a team that moves very fast so any criticism you read needs to be current.

After importing static screens from Sketch you then set properties, add animation, prototyping links between pages and generate full working native code or React Native apps.

Because it's constraining your work to the needs of the code generator, it's like having a developer by your side continuously. They also have a cloud product for sharing designs and reviewing.

Two other products worth looking at if you're just prototyping animations but want working output:

1. Haiku generates Lottie files and code so you can have mobile animation, but also has website output with more control, integrated with major JS frameworks. It's a competitor for After Effects.
2. Flow takes two Sketch artboards and generates the animation between them automatically, then lets you fiddle with it. It generates only Swift code for iOS apps at present but has a flexible generation system that's template driven.