Based on the evidence from clinical trials weight loss (typically 15 kg or greater) is the main driver and predictor of remission.
Dietary strategies for remission of type 2 diabetes: A narrative review — https://doi.org/10.1111/jhn.12938
A weight loss program can lead to type 2 diabetes remission, even in individuals with a normal body mass index (BMI), via loss of body fat, particularly in the liver and pancreas, shows a UK study.
Type 2 Diabetes Remission Possible For Those With Lower BMI — https://www.medscape.com/viewarticle/971599?src=rss#vp_1
The title of this post is a direct quote from an Endocrinologist who at the time was practicing in Dallas Texas. I asked if he had any advice for me to reduce my risk of developing diabetes.
“Stay as thin as you can as long as you can.”
These words have stuck with me ever since.
lifeunderwriter.net 
The main downsides I see to staying as thin as you can are lack of reserve in case of illness or trauma, and lack of cushioning in case of a fall.
Another downside would be people with eating disorders taking the message out of context (diabetes risk reduction). Kind of far fetched but you never know nowadays.