Most builders I know can switch between imperial and metric no problem. They’ll often as for 2.4m of 4×2. Of and 8×4 sheet of 12mm plasterboard.
As someone who uses a lot of timber (lots and lots and lots of it) I’m like that – an upside is the maths of metric work better for materials sold in imperial sizes. Metric works really well when being added to, the Imperial system works best in dividing things up. By happy accident the existing sheet sizes for timber divide nicely in metric too and generally what people do with wood is cut it up.
Whats wrong though is lumber and sheets have two slightly different metric approximations of imperial – sheets are typically close to genuine imperial sizes ( near to 2444mm x 1222mm). However lengths of timber are a metric equivalent of imperial but rounded down to the nearest 100mm – so 4.8m instead of 16ft (which is 88mm shorter than 16ft) so when you’re making structures that combine timber and sheets the timber is always too short and no matter how clever you are with framing theres always loads of wastage and I finish each job with stacks of nearly useful short lengths of timber. And I think “fab look at all that free firewood” then I remember that that free wood cost me hundreds of pounds.