Instead of complaining about the posts, take a close look at what people are pointing out to you or warning you about... Here are the tips for free.
My personal assessment: Construction company recommended by the lawyer... you're repeatedly falling into the same ******.
Recommendation: Finish the legal battle with GU2. Then finish building the house with a local architect and local craftsmen under individual contracts.
PS: I would not break out the screed in the bathrooms now, just because there is underfloor heating beneath the tub. What could happen? The screed heats up and transfers the heat to the bathtub cladding, which then passes it on to the room. I also don't believe the underfloor heating pipes will be crushed by the weight of the tub. Screed is concrete, not elastic but rigid. As long as it withstands the load, nothing will happen to the pipes. You can ask the screed manufacturer about the critical load limit and determine the maximum load. If too high, reduce the pressure per unit area with a larger support surface...
Good luck with the legal battle!