Graphite new or old has little mass and is stiff, so need to be loaded in order to cast a line out near or far. Glass and bamboo, having more mass, are more forgiving with a wider range of lines, and are (in my opinion) nicer to use.
I have an, apparently desirable, SAGE III GFL 3wt 7'9" LL (light line) graphite SH wisp of a trout rod, which I admit to not using much. 3 or 4 wt DT lines are fine on the rod. I have a few other SAGE and various graphite fly rods, SH and DH, which are also gathering dust as I find that I reach for bamboo most of the time for various methods and species. With such fly rods there is no worrying and fussing about specific windows of lines which will work with them.
My favourite DT line to use: a mere green Phoenix 4 wt silk line made by Mike Peters in France, on a 4wt 6' SH F E Thomas taper, rod. It is fun to mini spey cast on small streams, or roll or overhead; being much thinner than plastic lines, silk falls like 'thistle down' on the surface, creating no disturbance in the air either, being darker and non flash. The thinner silk lines also cut through the air better, so surprisingly good casts are possible with little effort.
By way of contrast, cut a plastic DT in half and splice it to a running line and you will have, in effect, a very capable shootiing head with a longer front taper and of course two lines, as no one ever sees the reverse half of a DT line, for the most part. Allows for a smaller reel to be used, very useful in smaller sizes.
A single lift and haul (from a boat), thinking here of SH SAGE RPL 8wt., a large bass bug can be cast a very decent distance with a half DT 10wt. Most importantly for me, the casting stroke will be slower and less frantic than trying to keep a WF line going.
All my plastic lines I dye darker browns, whenever possible, and my rods are satin finish.. bamboo that is.
Malcolm