Criticising Froome for the manner of the win is like criticising Alistair Cook for not hitting enough sixes.
It’s interesting now that people often still refer to the stage in 2012 when Froome was trying to go hard off the front and Wiggins pulled him back with reference to “Froome could obviously have beaten Wiggins in 2012” but that seems a bit hypocritical given that Froome’s / Sky’s tactics are still similar – on that (2012) stage Wiggins was going at the pace and with the power deployed that they’d worked out, in detail, was what was needed.
So, yes, Froome could have gone off harder, and maybe Wiggins could have gone with him (or maybe he couldn’t) – but the plan wasn’t to set that stage on fire, or give either of them a stage win, or to improve Froome’s GC – it was to get the yellow into Paris on Wiggins’ back.
An equivalent this year might be saying that either Thomas or Landa could have beaten Froome if they’d been let off the leash and allowed to go for it. (Landa in particular given that he survived the race – was it once or twice they pulled him back to support Froome at the potential expense of his own GC aspirations?)