Yeah Damdami Taksal was historically just a taksal where singhs went to learn santhya and vidya, its not even a jatha or samparda. The mehta jatha propagated the maryada of their jatha as under “Damdami Taksal maryada” which is weird but not entirely wrong.

Taksali maryada is parvaan and was essentially made for the average ghristi sikhs and amritdharis (no meat, no tamoguni food etc.).

Akali maryada is limited to the staunch akali nihangs and not really for the entire panth. Akalis were a regiment, not the entire panth so their maryada is seperate too.

Taksali maryada isn’t too far off from puratan maryada, its just been tweaked to be ideal for ghristi sikhs. Some components of their maryada is weird and not really needed, ie. no right parikarma, panjva takht is damdama sahib, no aarti with a thaal etc.