I think it is ok to save loungers and /or a table for SHORT periods of time. when hubby and I go to a pool, it is usually for a couple hours, at least. you DO want to actually swim in the pool, go to the bathroom, refill your mug, maybe get something to eat, go to the DSA for a smoke.
I have read thread where people think a half hour is too much. well, at stormalong bay, you have to leave the area to get to a dsa. then, might as well use the washroom right there by the dsa. and now you might have a line to show your wristband to get back in.. and might as well refill you mug, while you're up. well, that could take a half hour!
then , you lie down for a bit, and you both decide to use the slide, or swim for a bit.
but as long as you are in the pool area, and using the chairs on and off, I think it is ok.
good news: on our next trip, the dsas won't be an issue for us: we QUIT smoking in JAN!!!

"saving" chairs for after you come back from breakfast, or the parks, or one person saving for the whole family who are in the parks, etc.. no way!
at vero beach resort last july, we witnessed a "hogger" family.. you have a choice.. the pool or the beach.
now, there's planty room on the beach.. you can
set up camp" and leave it there the whole day. and, if you want , you can rent loungers with umbrellas
at the pool? you are NOT supposed to save chairs at the pol while you are on the beach. the same lady, every day while we were there, was at the pool reserving 2 or 3 tables with umbrellas and about 10 loungers for theri group. whle stuff was spread out on the tables, and towels on the loungers. there was NEVER a time when all 3 table were used,. the family was mostly at the beach all day. but would come and go. each had their "own" lounger, "in case" they wanted to be by the pool for a little while.