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I would say as an overarching point, that those early products were loosely designed around a relationship with messengers (who were OG wear testers) and as such were intended to be robust, but as the Team Sky era dawned products definitely went into the more efficiency / performance focussed realm, which inevitably doesn't lend itself to longevity.
Not trying to justify poor construction as noted above (more factories, more products, more people working at a higher pace, cost margins etc will probably be the direct contributors here) but it's worth considering that there's likely only a handful of products that are made for 5/10 year wear cycles now. This isn't an argument btw, just trying to add some more perspective.
it's probably true, and probably also a conscious decision in some ways. i have not bought rapha in ages but i am still wearing my classic merino jersey bought in 2013. no tears, no stretch beyond normal, not sure what i can do... also have a winter jersey from 4 or 5 years for cold weather, it looks new.