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> but those are rare.

yeah sure, if you ignore the existence of literally every mobile isp.

Hard disagree... there are still a vast many providers around the world doing < 1500, such as PPPoE DSL.

Isn‘t sub-1500 bytes the norm for residential internet access? (DOCSIS and DSL with PPPoE are the most common access protocols here in Germany)

looks at Japan, UK (OpenReach), and a lot of other places still using PPPoE (on fiber!) for complicated reasons

Some of those (including many providers on Openreach) will support mini-jumbo frames that allow an MTU of 1500 inside pppoe.