Some metric units are awkward but so are most imperial. I tend to use a mixture of both.

At least with metric we don't have the totally stupid variation between North American and English. Your gallon is different, the wire gauge is different and I have to convert many of your imperial units and unless specified I have no idea which are meant.

This is particularly true with hydro when gallons are quoted. ( which ones).

For wind and electrical calculations metric is far easier, the answer comes out directly in Watts without going to horespower ( which again is a bit variable between countries).

I don't like the Pascal or the Weber, I can't think in 10 to the minus umpteen but generally metric is fine. Fractions are ok up to about 1/16 but I wouldn't have a clue what 17/64 was.