I don't soak bean seeds.
But if I have old or otherwise questionable seeds I will start some of them in a plastic bag in a damp paper towel. Even then, they'll only be in it long enough for that first root to show. I did that with 10 of the Dapple Grey seeds. Turned out though that the bed planted ones were just leisurely sprouting. Doing that with beans should not be needed, but for old or very slow sprouting, or important to sprout seeds it can be done with care and at the proper temperature. I left the baggie open but folded over once, the paper towel was just between wet and damp, and the seeds were separated well enough that I could pull the paper towel apart carefully. I have only ever used this GERMINATION TEST method twice for Beans.
Tomato seeds I've used this method 3 times, but that first time in 2004 it was with 35 varieties. Again, they'd really only need this method for old or critical seed.
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Soaking seed is mostly for certain species that need it.