If it gets you on a bike and puts a smile on your face, do it.
It's also totally fine to have both old and new. I don't have the same system on any of my bikes.
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59 Allegro Special -- 72 Bob Jackson -- 74 Motobecane Grand Jubile -- 74 Sekine SHS 271 -- 80 Nishiki International
85 Shogun 800 -- 86 Tommasini Super Prestige -- 92 Specialized Rockhopper -- 17 Colnago Arabesque