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When traveling in Japan, I do recall seeing TVs marked in inches. But in a world where globalization has made goods ever more accessible and affordable, this shouldn't be too surprising.
Another example of ostensibly American or British Imperial units, lots of plumbing around the world is sized in inches or fractions of inches. But even in the USA, there might not be any dimension which actually measures the same as the trade designation. For example, 1/2-inch Schedule 40 PVC pipe has an inner and outer diameter that is larger than 0.5 inch (12.7 mm). In the UK, I understand that they might round off these trade designations to centimeters, but I have no idea if that would then reflect their true outside diameter or if it's just a straight conversion of the trade destination.
Aviation also uses feet for altitude in most of the world, with even ardently metric countries like Russia changing in 2017-2020 from meters to feet. In all these cases, it's ultimately a matter of harmonization to reduce confusion and increase compatibility, either technically, procedurally, or economically.
TV's and plumbing are still measured in inches in the UK, the measuring system was already in place when we went metric and it was what people were used to. Plumbing fittings are as you said now rounded off to millimetres etc. but the actual physical size is still the same as the original imperial. For example what is referred to as a 25mm fitting is actually one inch (25.4 mm).