Interesting!
I think that I tend to apply a little too much tension to belts, rather than too little.
When my generic 4 1/2" Bandsaw occasionally jams, the belt does slip.
But I avoid leaving any machine running and unattended; for obvious reasons.
When I tired to weigh the saw, the needle went right round the dial and hit the stop, indicating 114 lbs. (50 Kgs+ )
Now I know why I gave up lifting ( JUST ) the saw in and out of the shop. It now lives outside, under a cover made of curtainsider material, having been sprayed with oil after almost every use.
It is used dry, because of the fear that lubricating the blade, although it may help the cut, could cause slip relative to the driving wheel.
Howard