Never had a table, but I've never used a lot of things I'm not shy about commenting on!!

I feel the same way about them as I do about umbrellas, sun shelves, and the like. The pool is for swimming, jumping, diving, splashing and playing. The deck is for lounging and relaxing. Why should everyone else have to sit still in a pool so you can eat in it?!? My typical set up: warm, dry, comfortable, a drink, a snack, maybe my phone, sometimes an iPad, a chaise or chair, a dry towel, a pillow. (Ahhhh, can't wait for pool season.)
None of that works for me over water...
Do you have any kids, or friends, or relatives that are going to remember for more than 30 seconds that your drink and nachos are on the pool table? I don't...
And if you just
have to have a drink while you're in the pool (I admit, I sometimes do), is there some inherent reason that a wobbly table in one spot is more convenient than the 100' or so of concrete (stable!) deck that is surrounding your entire pool? Sorry, don't get tables (even if they
didn't have all the issues others have described)...