Unfortunately, so very many people buy kayaks with no real understanding of their...and the yaks...limitations.
When I was active on a couple of yak sites, nearly every week somebody would ask "what is a good kayak". The answers would come flowing out...with nary a mention or question about the user's weight; age; flexibility; usage, etc.
I guarantee that the yak that properly fit me.... OLD; Non-Flexible; heavy, Tall, Salt-Water flats fisherman...etc. would be the wrong yak for a 5 foot 8 inch, 30 something who wanted to go whitewater drifting down rivers.
The so-called "weight limits" on yaks are generally well over-stated. A "250 lb. yak" often fits a 125 lb guy and his gear ok. It often DOESN'T fit a 225 lb guy who just read the label.
Try it before you buy it.... is still the best advice anyone can give, IMHO.