Inherent problem with poly boats is they have to be built to avoid 'tin canning', which adds mass and weight. Conversely, coupla guys who swing for Kings on the OR coast do so from 7.5' Kevlar prams that weigh 30#, and after a coupla decades of use remain in great condition. The builder went out of business as the market for such craft is so limited.
This summer saw an older guy in a van back up to the waters edge at the Quinn River ramp, extend ramps from the back and slide a varnished wood pram out of the van and into the water.
Lifting anything overhead is not only a chore for elders, it can be the last straw for those worn out rotator cuffs holding on by a few threads...