Another factor which is not mentioned much in the perpetual double/triple debate is your body weight- if you weight 300 lbs climbing will usually be a lot more difficult than for someone who weighs 150 lbs.
Hence a 150 lb person who rides mostly on the flats will of course not see the need for a triple.
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only the dead have seen the end of mass motorized stupidity
Plato
(well if he was alive today he would have written it)