I’m the same, if someone tells me a bass is 9.5lbs I know how that bass is going to feel for a 3hr practice, but if someone said another bass is 4kg I’d have to convert to lbs.
And not just re basses, someone who is 6ft tall and 11 stone I know is going to be rather slim. Tell me they’re 70 or 80kg and I’ve no idea. Similarly tell me a chap is 1.75metres tall, no clues, but 6ft1, a tad taller than me.
For anyone thinking I’ve done the math wrong, I’ve just made up numbers.