Why do some doctors only do a 2 week liquid diet post op, and some do 3? Like what is the difference/reasoning?

The diet varies based on the need to the surgeon and patient

Surgeons like to shrink the liver to have greater visibility during laproscopic surgeries in the abdomen. Livers in obese people ate larger usually due to a condition called fatty liver. To reduce the size your body must go into ketosis (fat metabolism) and the liquid diets speed this up. That being said I did not require a liquid diet prior to the two days before where almost everyone goes only on clear liquids.

My doctor only recommended a 2wk post op liquid diet, but allowed me to proceed to the next stage 10 days after surgery. It all depends on the surgeon/doctor and how they run their program. Honestly, I don't know if there is a difference.

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This is still an evolving field, So different programs use different best practices and data. Some have very restrictive post surgery diets and others don't. Generally the purpose post op is to give you time to heal and minimize complications. Many programs also track their own data, so if they find one approach gives better results (more loss, fewer complications) then they will tweak their recommendations. You can ask a program about their statistics, which is enlightening. For example my specific program sees better than national averages in terms of loss from the sleeve, but really limits carbs VS others.

Ugh read the post wrong and responded incorrectly...

It's usually based on each person's progress and that particular surgeons comfort level progressing patients through the stages

There is no rhyme or reason to it.

Some doctors base their practices on old information.

Some doctors base their practices on new research.

Some doctors use data, some use personal prejudices, some do what's easiest.

Some doctors don't really care about their patients long term health or long term success....they concentrate on shockingly fast weight loss only....because it keeps the new clients pouring in.