Fleck still makes whips as far as I know. Lots of the Driving folks use them. They are NOT cheap, but that might be an incentive to taking better care of it!!
Light weight does not mean “delicate or fragile” but if you leave them laying around, out on the ground, their lives will be shorter than if you put it in the barn, hang it up after use. We have a couple daily use whips from Witmer’s that must be close to 25 years old, still doing pretty well. No breaks, but a couple rubs on the string coat got covered with electric tape to stop the fraying, they work fine. Gets lots of daily use with multiple young horses.
Those cheap, braided poly rope covered lunge whips from TSC type places ARE wrist killers! Top heavy, way too short of lash length to ever reach the horse, impossible to get balanced. Using one very much will CREATE wrist problems dragging your hand sideways!
Go for the light weight whip, long stick, then add enough lash to be useful. We have two extendable whips, but husband prefers the one-piece stick with long lash. He has practiced enough to put the lash tip exactly where he wants, to touch-up a lazy horse. I should sell the two extendables, they never get used.
Then take good care of your nice whip. Last time I shopped for the NICE fancy long, light whip he drives with, they were over $100. Way too much to mistreat it and need to buy another!! Horse budget can’t take hits like that!