I know it’s down to personal choice but why would anyone want 11, 12, 13, 14, 15, 16, 17ft length rods of the same model. Why won’t a 12ft do the same job as an 11 or 13 ft model?
Are Drennan and other rod builders having a laugh at your expense.
I wouldn't want, and don't have, every length. I see the value in rods of different lengths, but not to the extent of having a rod at every length from 11 to 17'. My preference is to have choices of float rods at 11, 13, 15 and 17'. I've no interest in the inbetweeners at all. I don't own a single 12' float rod and only one 14'er. 13' is my default compromise float rod length and I find that just a foot more or less is nether here nor there. It's simply the Goldilocks effect, I want rods that are just right, for a given scenario, not too short or too long. For those that don't want to buy many rods, I can understand that they will compromise with one or maybe two different length rods. I don't want to, or have to, compromise. My compromises come in different areas of my life, not fishing gear (or music/hi-fi).
I use 11' rods on small rivers/becks and small stillwaters with encroaching trees. 13, 15 and 17' rods would be a hinderance or utterly unusable on such venues.
13' is my compromise default choice. I'll use them for waggler fishing on rivers and stillwater work.
15'ers come into play on deeper stillwaters and for river trotting. I reckon that I probably use 15' rods more than any other length, but the venues I fish play a significant part in that.
17'ers are used for trotting when conditions are unfavourable and also on very deep stillwaters. I still can't abide fishing slider floats.
I've not yet found a rod longer than 17' that I'd be happy to use, or I'd probably have a 19/20' rod.
Naturally, I don't believe that anyone is having a laugh at my expense, other than some other anglers that will never get it. Many anglers don't fish especially varied venues these days. If I were one of them, I doubt I'd have more than a couple of different float rods. If I were a commie angler, I doubt I'd bother having a rod greater than 12' long. My gear gets used, a lot. I don't buy stuff for the just in case scenario. If I didn't fish venues that make such gear useful, I wouldn't buy for the sake of it. I don't like anyone in the tackle trade enough to just give them my money.