what is dogmatism and what is the problem of it?

what is dogmatism and what is the problem of it?
Dogmatism is
the way to recognize things by the rule or theory that was organized and abstracted.

what is the problem of dogmatism?
1) don't look at the fact the reality and just only apply theory or analyisis that one thinks it is true. And trap in the failure.

Let's say we use google every time and we also use review for eat lunch outside or buy something.
But sometime this review doesn't reflect reality.
So we sometimes fail to eat and buy good commodity.
the reason of that failure is because we just by using review and decide which store is more better than another.
And even if the Store is good for someone, the others maybe don't like it.
the reason of this phenomenon is because our value is not same and so diverse.
someone doesn't mind the service of clerks and attach importance to the atmosphere or some environment on the matter and vice versa.
the rule or theory that was abstracted don't look at this point.
so this is the problem of dogmatism.
Because the examples that I mentioned above is too simple and don't affect the life of us so it is not big problem.
however when we look at political fields or economic fields we can see the big influences of dogmatism on reality and it effects sometime so badly.
so we shouldn’t consider dogmatism as not important things.