Amen to the second bit. I don't see much similarity between Stroll and Latifi though, apart from them being Canadian and having wealthy parents. Stroll snr controlled every aspect of Lance's career and hung around the paddock intimidating team people, then bought a team, while Latifi snr is very much content to remain in the background. I'm not sure he's ever been seen at McLaren or Williams, has he? In any case, Nicholas is his own man. Lance wanted a shortcut into F1, Nicholas has been prepared to serve his apprenticeship (and frankly I think doing a few seasons in F2 is excellent prep for F1 - Lance should have done at least one season there imo). Finally he seems a much nicer and more positive guy and prepared to work hard with the engineers.
Don't get me wrong, I don't think he's future WDC material, but I think he'll generally be around 3 tenths off Russell rather than Kubica's half a second/one second, and will be much better for team cohesion and morale. Williams has one superstar already, they just need a solid wingman who can push Russell a bit but generally be supportive.
And the cash will help a lot.