NACS is far less clunky than CCS. And don’t get me started on ChaDeMo - my best guess is that whoever designed it thought that big heavy awkward gasoline nozzles where cool and wanted their EV chargers to be at least as massive.
ChaDeMonis basically dead now other than for existing cars. A typical U.K. service station will have 20 ccs chargers for every chademo, and nobody is deploying the latter for new places.
Means existing chademo cars will have less value as time goes on.
I think massive CHAdeMO plugs might have been for ultra rapid charging that never rolled out. There are brochures of 350kW+ watercooled CHAdeMO charging test equipment floating online, noted as plug limited to 200kW, dated at least as far back as 2015. That was when Tesla was still rolling out V2 150kW. So the plug overall dimensions and pin sizes are probably way overspecced for what it is in practice.