Why is MoT used?

[Zarax]

Marian reforms can be disabled in the campaign using descr_strat.txt.
As already pointed out they allow roster changes without additional scripting, which is useful for those units that don't have strict prerequisites, as well as being the only available bodyguard trigger.

[Ludens]

Marian reforms can be disabled in the campaign using descr_strat.txt.
As already pointed out they allow roster changes without additional scripting, which is useful for those units that don't have strict prerequisites, as well as being the only available bodyguard trigger.

To expand on this: scripted reforms require a building-line, of which EB has none left available. The script is also resource intensive (although adding a reform probably won't slow it down noticably). So using the script for reforms without strict prerequisites is overkill: MoT works just as well and is easier to implement.