This is interesting primarily because for most part I switch-off my location services as I think it's a drain on my battery. The only time it's enabled is when I need the GPS which is quite seldom. So I would assume that it would affect the accuracy of the model if say I live quite a way off from where I work.
Also if I'm spending most of my time indoors in buildings, how much of it would affect the readings as compared to when I'm out in the open?
> Also if I'm spending most of my time indoors in buildings, how much of it would affect the readings as compared to when I'm out in the open?
Indoor vs. outdoor isn't really a problem most of the time - the pressure is basically the same inside and outside. A bigger problem is fast altitude changes, which make the absolute reading from the barometer very difficult to interpret safely.
One of the reasons that it took so long for TWC to finally do this is because of the concerns you just voiced: that having this data might actually make the models worse, if they don't take enough care to quality-control it first.
A lot of the research done by scientists (like Cliff Mass at the University of Washington) is how to assimilate this data in a reliable and trusted way. It is likely that The Weather Company does not know how to use the exact pressure readings from the barometer yet (nobody does). Instead, they will probably use the trends over time (say 6 hours), because those are more resilient to noise.
Also if I'm spending most of my time indoors in buildings, how much of it would affect the readings as compared to when I'm out in the open?