10GbE adoption feels different from the successful string of standard speeds that came prior, since the market congealed around one standards family per Etherne

10GbE adoption feels different from the successful string of standard speeds that came prior, since the market congealed around one standards family per Ethernet speed circa say 100Base-TX. We've heard stories as horrific as RJ45 assemblies heating up to a degree such that thermoplastic would flow. Was some threshold crossed where 10Gbit over CAT6-whatever cabling is crossing physics thresholds? Or perhaps 10Gbit was brought to market when tech supporting copper connections wasn't yet mature enough?