I will continue to applaud Ange for his "dogmatism". I don't think he's any more or worse in his dogmatic approach than Pep, Klopp, Arteta etc.
I think he knows that there will be real bumps in the road with that approach. But I also think it's a good path forward. To actually instill a system of play over time.
He does make tactical tweaks and changes. But not big strategic changes. Had he done that at this point I would start being concerned.
I don't think we can realistically describe things going wrong now as "glaring flaws" in his system. Give other system based managers similar squad weaknesses and I think you would see similar flaws. As we have seen with others in the past. Here and elsewhere.
Pochettino gets brought up repeatedly and the point is often made about a lack of signings and it's a valid point. It was a huge obstacle to overcome. He ended up with too many players that either weren't good enough or didn't fit the system. And it fell apart. Similarly early on for Klopp, Arteta, even Pep.
Sticking dogmaticly to a system will sometimes fail spectacularly. But imo it's also the best path to real growth and development into something that can be really good.