There’s an approach in design thinking that you should only ever present half-baked prototypes to a team or client - if they see a somewhat polished product, one a few things can go through their mind: you’ve put so much effort into it, that you must really know what you’re doing, and will accept it as is with no further input; they might also think that you’ve committed to an idea that they didn’t endorse or have a hand in. They might also feel pity that you put in so much effort, and just let you do it.
All of these things relate to your points: you want them to contribute to the creative process, which ultimately results in a better product, and makes them feel like they’ve made a positive contribution. Everyone wins: you get hired again because you deliver a good product while making them feel good.
I have experienced exactly this. Painstakingly detailed wireframes that look like finished designs. What I have gotten back from world-class designers are my exact design but expertly, gloriously, colored inside the lines I inadvertently created and that the designers and team thought they shouldn't alter.
All of these things relate to your points: you want them to contribute to the creative process, which ultimately results in a better product, and makes them feel like they’ve made a positive contribution. Everyone wins: you get hired again because you deliver a good product while making them feel good.