I find it legitimate and there is no need to turn up one's nose if one wants to build relatively cheaply. Here in Bavaria, the land alone is so expensive that it is often not enough for an architect-designed house. That can then also be Flair113. If someone is satisfied with that, then that is completely okay.
We do not know what the OP envisions; meanwhile, there is now a 6-page discussion here, but unfortunately no feedback from her yet.
I think both companies she mentioned offer solid solutions; it just depends on what she wants. For a custom-designed house, it is definitely interesting to also look at local providers. If she wants a pure standard, then she is probably better off with a large, nationwide company. There are certainly more than the two providers she mentioned; I would definitely look at those as well. But perhaps she has already done that, and these two have remained on her shortlist after a long examination and she only wants our opinion on these two providers.
Everything we are doing now is speculation. I would wait for another statement from the OP about what exactly she needs and wants.