Hi Thanos

See above to Jon E post^.

I didn't (need) read the pdf he posted, but to emphasise this is not particularly a "style" it is construction
necessity.

These piered or columned walls when constructing high heavy walls add essential strength.

It might seem ridiculous but this adds MORE strength or stability to the wall than does
making it all doubly thick. (eg Stand a book upright, then two to make it wider then enough pressure
to topple it/them. Then just a single book with say two decent candles at the edges... see much more stable!)

If the structure has significant lateral load (like a cathedral roof) then they are further enhanced as
buttresses (wider at bottom).

Djosers pyramid complex wall is the same.

The only other alternative is very large blocks very wide like you have noted the extreme and fascinating
situation with the valley and mortuary "temples" at Giza.
(That is a another story but those "temple walls" were designed to carry massive weight IMHO!)

Also doorways, note how even the many blind or false doorways and the doorways on the sarcophogus's
have three layers. This zig zag twice adds super strength to that part of the otherwise weak part of the wall.

Structural necessity, not necessarily for making it look pretty!

Cheers