What is the ruling on building mihrabs in mosques, and what is the ruling on praying in them?

The Shaykh : As for praying in the mihrab, in my knowledge, the Salaf did not use the word mihrab in the sense known today in mosques; rather, they called it the taq, the taq, and the meaning of taq is an opening in the wall. So if the imam...
The student : First: they also called it the madhbah, O Shaykh.

The Shaykh : What? The madhbah!
The student : The madhbah.

The Shaykh : And it is in this hadith.
The student: Yes.

The Shaykh : ؟!
The student: Yes.

The Shaykh : Yes, the point is: if the imam is able to deviate from this taq, then that is the sunnah, and there are two benefits in that: the first relates to the imam himself, and the other relates to those behind him, because if they see the imam consistently staying away from the taq, whether a little or a lot, they will ask themselves: first, and then they will ask the imam second, why do you not pray in the mihrab? He will answer them: because this is the sunnah. I said if he is able to do this, and in my opinion this is possible and easy, but you said in the context of your question: if he is forced! I did not understand how the coercion would be.
The student : I mean, it actually happened to me, O Shaykh.

The Shaykh : Yes.
The student : And roughly the same thing I mentioned happened. I used to deviate slightly from what is called the taq or the madhbah or the mihrab as it is called these days. The man who built the mosque has a status in the town, and he is from a well-known family from the region, so he inquired why I had deviated from this. At first, he did not find my deviation objectionable, but when I informed him of the sunnah that I should not pray in this place, his anger flared up, and he began to insist that I pray in this spot.

The Shaykh: Allah is the Greatest!!
The student : Otherwise, he would report it to the Waqf or something similar, so I was forced at times to put half of myself inside this taq, and when I prostrated, half of my head and body would be...

The Shaykh : Well, if you were to proceed with gradual accommodation, if you were compelled, you would stand entirely outside the mihrab, not standing in half the mihrab, but facing the mihrab. If he continued to object, you would move forward a little, meaning from the perspective of: "O my Lord, some evil is less than some," is that clear?
The student: Yes.

The Shaykh: All right.
The student : O Shaykh, please go ahead.

The Shaykh : Oh Allah.
The student : Bring the hooks.

The Shaykh : May Allah be your helper.
The student : O Allah, amen.
Another student: So he submitted these papers to the court.
The student : O my Shaykh, I tried it... I tried it twice!