If someone offers the slimmest phone, I have some doubts regarding structural integrity. Especially, the way I (unintentionally) often treat my phone, it'll probably bend or break within weeks.
Military grade impresses everyone but those who served.
In the mind of a soldier military grade is the cheapest, mass produced item that barely does the job, can be abandoned on the battlefield without regrets 😅
Is that a protected term where you live? In Germany a lot of products, including the cheapest and crappiest ones, are advertised as military grade and that doesn't give any indication on quality or durability.
I searched amazon and could not find a single smartphone with MIL-STD-810H certification atleast not in my region – india. It's super rare if you can even find one.
I have no clue what that standard certifies but I was able to find several such phones immediately on the German Amazon like this one for 140€ (around $150 right now) from a brand that I never heard of.