LVP in whole house... what about bathroom?

We're about to tear out all floor coverings in our house and replace with floating LVP (Flooret) with pad preinstalled on the back. We tore down a few walls so we have a very open concept. Our subfloor is plywood. The coverings right now include berber, linoleum, hardwood, and ceramic tile - so tiling over them is not an option due to all different heights and we want one seamless surface. So that bathroom - I have some concerns.
1. Do I take out the threshold marble strip so that there are no transitions? Is this a preference thing, or does it serve a greater purpose?
2. I have boys (10 & 11). Sometimes their aim is off. I know the vinyl is waterproof, but there are still cracks between the tiles. How do I keep the permanent stench of urine away if urine should happen to seep through?
3. Similar issue... if we bathe the dog, or the boys leave the shower liner out of the tub and lots of water gets on the floor, isn't it going to run under the tiles through the very same cracks? I guess the same concern exists for plumbing catastrophes in the kitchen/laundry area too. I know the tiles themselves are safe... what about the subfloor underneath?

Thanks all.

 

When I installed a floating click-together laminate floor in my old kitchen the instructions advised gluing the planks together in wet areas. So I did that around the sink and in the few feet around the patio door. I would imagine a similar approach would work with LVP, though I've not used it yet (planning to use it in my kitchen (different house) next year, though.)

I think the use of a marble threshold would be more of a preference in your scenario since there is not change in floor height or material. I would just run the floor right through the doorway with no threshold. I assume there needs to be a gap along the perimeter to allow for expansion - you might fill the gap along the tub with silicone to prevent water from seeping under. Just make sure on the opposite wall you leave enough gap to allow for expansion.

 

In time you will get bored with having the same thing throughout the house.

 

i installed all flooring in our rebuild, and put a piece of sheet vinyl, caulked the edges and toilet flange, in the bathroom. I've had enough homes with bathroom water issues and a quality piece of sheet vinyl will last forever and you can dump a bucket of water on in and clean it up with no infiltration anywhere.