Salaam.
The Quran allows one to use
dirt in place of running water, if it is not ...say "available",
in the same way that many people surround themselves with burning sage or sweet grass smoke when they pray.
There is a message in this that falls outside of simple, literal translation.
I think what the person meant, who said that one can pray in the nude if they choose to do so,
is that we are not bound to the sort of malignant, ritualistic behaviour which takes the breath
out of the words left for us by the Messenger through his close Companions.
We are to be clean, we are to be modest.
We are to pray as we were taught and regularly, according to the movement of the day.
Imagine a place where the sun shines constantly for much of the year....
It's best to reach for the essence of the teachings, to read them in your own light,
to apply them to your own life, while giving others room to find and apply their own understanding,
as Al Lah reveals it to them personally.
We forget that Shaykh was often there, in the distant past, for a vast number of people
who couldn't even read. To teach them to read, even. My shaykh lives on the other side of the world and he would be ashamed of me if I were not able to figure it out for myself.

Times change. That is not bi'dah. That is time.
P e a c e .