You keep making this assertion, and those of us who've delved into vintage Fenders and modded them - in my case split channel, footswich boost, modded channels - tell you that the moment you add or subtract it's no longer 'vintage'. Everything has an impact To add an FX loop Marshall's engineers jammed an extra valve into the Bassman circuit to drive and recover the signal, because otherwise like reverb in a Fender you lose too much gain. And there's not a ton of gain in these to start with. There's also not much real estate in these with the reverb transformer. To add that in a PR brings you to six valves where you don't have it. In a TRRI or DRRI to seven. If you stick opamps in these the purists and punters will crucify you, simple solution though that is. Then there's marketing . We already have people confused between BF and 68 Custom RIs. Are you going to have a special retromod version of each? That's an awful lot of heavy hardware for dealers to support and carry. Added confusion, and you have to keep vendors happy who may suffer costs if they get excessive returns due to inappropriate purchase. Any manufacturer has to consider all these things. You're saying Mesas aren't Fenders - but since the Blue Angel and Express series the clean channel is a BF clean channel with - effects loop, DI in some cases and extra controls like mids, presence and gain/MV. You said it yourself - it's not a Fender because the additional capabilities like bigger transformers and Dyna-power remove the breakup character of the 6V6 and 6L6 Fenders. Close - but no cigar.