Im kind of with you Mike
I have a Bream fly rod, (3-4wt) a small bass pond rod (5-7 wt) and then a serious LM Bass Rods (8-10 wt)
The reason I brought this thread up is because I think guys just getting into this sport get overwhelmed and missed lead Into thinking they have to have a streamer rod,a nymph rod and a dry fly rod because what they read here and in the mags/TV
Flyfishing can be a rich mans sport or a blue-collar sport.
I think most guys get lead to its a rich mans sport when it doesnt need to be
In my opinion, it's all about convenience. Will a 9' 5wt do most things? Yes. I have one, I love it, I fish it a lot. Is it too much rod for small stream trout, both in weight and length? For me, yes. Is a 10' rod more beneficial for nymph fishing trout streams? In my opinion, yes. Can I use the same 9' 5wt for dry fly and dry/dropper fishing as well as streamer fishing a trout stream? In most cases, yes. But, is it convenient to keep swapping leaders and tippet setups from 6x and a 12' leader for dry flies to a shorter leader and 2x for streamers? Nope. It's a whole lot more convenient, for me, to have a 6wt rigged with a streamer setup and carry two rods. Less time rigging, more time fishing.
One rod can do most things. I agree. But there are situations and scenarios where I don't think it's the perfect tool for the job. It's like carrying a Leatherman. It's good at some things, and it's handy, but if you have a stubborn screw to remove would you rather have the Leatherman or a screw driver that fits the screw head and is easier to use? The Leatherman can do it, a screw driver fits the situation better.