Yes membranes are waterproof. However, all membrane/laminate products come with a factory DWR. When that DWR wears out, the product needs to be re-treated.
Yes gore-tex or whatever is waterproof, but it is breathable also. In order to be breathable, it needs to be porous. Yes, the holes are small enough so only water vapor gets through. Remember, it is porous so water can and does get through if it has an opportunity.
If the DWR wears out water is able to sit on the shell and soak it. The shell itself is not a membrane/laminate so when the shell gets soaked, it will sit on the membrane/laminate. Two things now happen. Because water is sitting there the vapor (your sweat) cannot get through. So even if you don't think you sweat much- what little you do cannot get out and it builds up. The other thing is the water that sits on the shell will push its way through the mem/lam. The membrane/laminate is porous-Water can get through the smallest of pores. Don't be fooled gore-tex or anything else that is breathable is not totally waterproof. Water moves through any opening.
I sold all this stuff for 12 years before my current job. I have been to all the demos, workshops, etc. Trust me you need to replenish a DWR. There are spray on DWRs or wash in. I have used both and I like the spray on, but it needs to be applied more often. This is the same for jackets and pants. Gloves just wear out quicker. So, if anyone feels there me/lam jacket or pants are no longer waterproof (unless there is a defect or tear), just replenish the DWR. I do this every year. Sometimes a few times a year if I am feeling froggy.
I love Event. If i didn't get free gloves, I would likely go with Motorfist. Good luck man, cold frozen hands suck. I hope you end up with a good pair. Once you find the pair you like buy 2 or 3 because they always change the design at some point.