I disagree that metric works better in practice. Sure, with metric we can go to as many decimal places as we need for the accuracy required eg. 3.50000325 metres, if that's what's called for, rather than 3½ metres. But I always felt more comfortable with factors of 2,3,4,6 of a foot and then the ability to halve the inch and then halve again ad inf. instead of working in tens and tenths. I think it actually involves a different way of looking at measurement. As I'm old enough to be lucky enough to be able to work both systems with equal ease, I can see that they're not simple alternatives.