G1138: I dive in a drysuit with a hood. The problem with tucking is that, if you have a mask problem ( flooding or whatever ) it is very difficult to get your mask on again . Very tough to tuck it all around while clearing your mask etc. I trimmed my hood so that there is no hood close to my mask skirt. My face is not any colder . Solves the problem of tucking and any potential problems underwater. Works much better. When I first started diving ( not that long ago ) I used to tuck my mask under my hood on shore and then go in. My mask used to fog quite a bit due to the heat from my face when the mask hits the cold water. Now, mask around my neck as I go in ( except for boat dives where entry is quick ), easy to put on my mask in the water, good if your buddy or anybody is having any surface issues and takes some time to get adjusted.
A lot of my diving is inland lakes. I think for entry in heavy surf, my mask would be on pretty quick for obvious reasons. Either way, trimming works much better for me than tucking, and I think , safer too.
I dive in 54F waters average. I don't really have a problem with tucking, it's easy enough for me. But I will say that my hood leaks water right at my temples. It's not a real issue for me, I'm just too lazy to trim it.
If my mask comes off underwater, I'll just take the time to tuck it in before clearing my mask, it only takes me 2 seconds.
It's not ideal, but I don't see a huge safety risk with it.
I haven't had any problems with fogging, usually I just spit-rub-rinse before entering and the mask is good until I take it off above water. If you have a hot face, a neat little trick to help is to rub some cold water on your face before putting your mask on.