Floodchek hoses are very sturdy, and IMO well worth the extra cost compared to regular hoses. I'm not using mine anymore only because I got a Miele washer, and have to use the Miele hoses. The Expert in that thread is talking about a different kind of anti-flood hose, one that contains a valve which detects excessive water flow. There have been reports of these hoses not working properly with some FL washers. In contrast, Floodchek hoses are plain hoses of exceptionally robust construction.

Replace with normal hoses. New washers that are high efficiency can turn the water on and off too frequently during the filling process tripping the "flood stop" feature.

I guess I’d like to implement the best solution for any possibly scenario. I would have to speak to the plumber and/or the contractor to understand exactly what goes under the tile or can go under it to make it waterproof.. as of this moment I don’t know what the plan was. In my mind it would be like the shower, how they put down that black vinyl waterproof barrier, but maybe that’s not what they do...? I have bare plywood right now so I can do whatever is best- just have to understand what that is, so I’m looking for some input from anyone with experience. I’ll have a shut off valve for the water supply, so that should take care of any major water supply issues (if I remember to turn it off), so mainly a backup plan if the washer overflows, leaks, or malfunctions in some way when draining (plumbing backup?)

I think you get it, but not sure, so in case you didn't know a tub drain (that also has a showerhead) is probably 1 1/2", and a washing machine needs 2". Also, you need a standpipe for the washer. So you really can't use any of the tub piping. Also, a floor drain requires a 2", so ditto. Not sure how the pipes run and where they tie into the main stack, but that may be what they are referring to by saying "cap" the tub piping. You can certainly put a floor drain in a Laundry Room. It can not be covered or restricted by an appliance. A pan under the washer has to have an air gap when draining into the floor drain. So, many people do not want to step on a floor drain or even see one at all, or see any pipe crawling along the floor from the pan to the drain, or see the pan itself, since Laundry Rooms now have 'chic' decoration (meaning "fashionable," not "chick"=female!). Also, most upper level Laundry Rooms do not have sloped floors, so you would need to pipe the pan or water is free to go anywhere, not just toward a potential floor drain. A pan is good peace of mind, it can catch problems with the machine tub itself. However, most problems occur with the hoses and connections, and those leaks most likely won't occur over the pan. So they make "flood safe" hoses that auto-shutoff when a leak is detected. There are other more complicated systems available as well. As another peace of mind, you can lay Schluter Ditra on the floor for waterproofing. Assuming with that you will have ceramic/porcelain, you can also slope the floor to a drain as well, and use a metal decorative grate instead of PVC. So many options, just plan ahead what you choose so the details can be worked out.