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You're right. UK Cycling funding is determined solely by Olympic medals, so it's hardly surprising they concentrate on that, hence the focus on track. Sky and Ineos are both interested in media coverage which means the TdF, because it's the only cycling race most non-cyclists have heard of.
Therefore the UK does well in the Olympics and the TdF, not so well elsewhere (except the Giro and Vuelta very recently).
Ineos is only interested in the TdF and British Cycling is all about the Olympics. Ineos winning outside of the TdF is as much about the sheer quality of their roster as much as a plan. (Outside of the stage races they use to build for the Tour).
And it could have worked. 2014/2015 looked like the start of something, but G turned to stage racing and Stannard was compromised to make the Tour team every year. My theory anyways