Almost everyone I know uses a super siphon to transfer fuel from cans to tank. It's far less messy.
far less messy then what
I just got back from a 1,500 mile round trip to Moab...
My fuel cans saw a rise/drop in elevation up to 8K
and I'm sure muh cans got shook up a little too.
was no leakage or mess from that.
decided not to stop for fuel at one point, on the return trip
Poured 10 gallons in 60 seconds... add 2 minutes to retrieve the cans and spout and place at the filler door.
not a drop of 10 gallons went anywhere but in the tank
was no mess .
I guess I just don't understand your complaint...
or maybe U have leaky spouts/caps
I just think it's laziness...
unless of course, one is pumping excessive amounts of fuel,
on an industrial level.
Guess I'm just too old for change...
or...
how I do it, works fine for me, with little drama...
To U and yer friends...

whatever works for ya