Comox (and others) concern about the pressure surge when the moving water in a breaking wave hits an exposed radio is legit. Far higher momentary pressures than what a unit experiences sitting a metre under water (only about 0.1 atm or 1.5 PSI; somebody else can convert to kilopascals or whatever). For ordinary use, enclosure in a PFD pocket may help a lot with the surges. The pocket I use keeps the antenna about 20 cm away from my nose and has never been an issue. In surf, though might be.
I agree the IPX7 standard is sketchy for our use of VHF's. Check the seal system on yours and compare it to what ICOM does, in which the battery is fully enclosed and separate from the body of the radio. The body itself is fully sealed, also. Dollars to doughnuts most leaks occur at the battery-body seal in other brands.
I am with Comox. I want that VHF on my person. Too many scenarios in which accessing a radio in a dry bag, especially under a hatch, is difficult while in the water, juggling boat, paddle, etc. Oh, yeah, I do practice self rescue with the VHF in that pocket. It is not in the way. Even if it gets loose, it is lanyarded to the PFD.