In my country (EU) you need TRC if you don't deregister for tax purposes and are considered dual tax resident for that year under DTA. In the process of determining tax residency under DTA you must also provide TRC. If you only have other proofs that is not enough, they also want TRC and this procedure must be done every year unless you deregister.For whom would you need a TRC?
I have mentioned this before but I will mention it again. A TRC is meaningless to a foreign tax office. The foreign tax office decides if your a tax resident or not as defined by their laws i.e center of life, ties etc etc. A TRC is nice document for a bank or broker and that is about it. The foreign government can even deem you a dual tax resident in some cases. If you are concerned about a challenge one needs to do a complete disconnect from their old country, show a strong connection with expenses and lifestyle in new adopted country alongside a TRC. TRC is not a magic wand sadly.
The problem with UAE DTA is, it's written for UAE nationals only so you can't get UAE TRC as foreign national. I heard UAE changed this in March.