Wasn't there also a clear statement from @11ant to use large elements only made of aluminum precisely because of this issue (weight, warping, etc.)?
"Clear statement" is a big word, violations are not punishable. I would rather call it a "bold recommendation" and it refers to stress elements in general, such as lift-and-slide and folding door systems and similar large elements as well as entrance doors. I don't actually apply this recommendation to the tilt-and-turn door - but I recently had to learn that nowadays increasingly PVC frames without steel reinforcement are offered (which also explains why the provider does not want triple glazing). Although there are also double glazing options with satisfactory thermal transmittance values, I would generally prefer triple glazing: in principle, the insulating effect is more effective in the intermediate space than in the glass mass, so from this perspective one should not actually speak of triple and double glazing, but of two-interspace and one-interspace glazing. The reasons for my recommendation are manifold: for front doors, it is the total weight and the associated fact of slamming with force even when closing quietly, combined with the underestimated frequency of operation; for lift-and-slide doors, the lighter frame helps to compensate the weight of the several large panes a bit, and folding door systems simply have so many joints, guide, and suspension points that more stability is worth the extra cost already because in such a system all imbalances amplify each other (which is why only the best suppliers are used for the fittings). But as I said: if the OP provides the details, my recommendation can also become more specific.