We're bad at onshore wind, not due to lack of possible sites, but because of a government ban on building it: https://www.theguardian.com/environment/2022/nov/29/onshore-...
The government ban you mention only applies to England, which already has almost half of the UK's onshore wind despite having by far the least space for it. Making complaints that the rural population of England, already under pressure due to soaring population density, doesn't want their remaining rural spaces covered in wind turbines when plenty of other good options exist requires quite a bit of mental gymnastics to justify.
Population densities in people/km2: England 424, Scotland: 68, UK overall 272, Germany: 232, France: 118. Landmass in thousands of km2: England 130, Scotland: 77, UK overall 242, Germany: 357, France: 551.
The main reason we don’t get more of it is a handful of rich land owners not wanting an “eyesore” on their estates and using their influence to get that result.
This is not a democratic country, after all.