People read their phones on the toilet - probably every single modern phone user has done it at least once. It is not inconceivable that a small, but significant, number of them have fumbled the phone and it has fallen into the bowl.
Likewise, pools, beaches, and boats are places people are very likely to go with their phones in tow and in use. It is not unlikely some of those - one can assume - millions of instances have produced some contacts between phone and water.
I ride a motorcycle and mount my phone on the handlebars for guidance. I spend a lot of effort keeping it dry and have actually lost a couple of USB cables (but not the phone, thankfully) to damp.
While there is cross-pollination between macOS and iOS Macs are general purpose computers. And while it is true you cannot, like most PCs, crack open and customize a Mac and that to date most games are developed for PCs and not Macs as a side-effect of this (game development and hardware/graphics card development are incestuous), Macs are extremely capable computers that can meet demanding needs.
I have used Macs and PCs all my life. At this very moment I am playing Assassin’s Creed Odyssey in full pretty mode on a PC while my Mac in the other room renders a film and I type this message in an iPhone. I prefer using my Mac over the PC for most things - and certainly the Mac is where my bread is buttered - my PC is a fancy launcher for Steam.
Without being impolite, it sounds like you looked at the Mac, but didn’t bother to actually use it for anything practical, tasks at which it excels.