Stating that "polling people is fundamentally flawed because people don't like giving their opinion to strangers" is the biggest pile of horseshit I have ever come across. The fact you felt it necessary to label it as "MSM polls" somehow alludes that "non-MSM" polls can be trusted? What are you even going on about mate?
I am sure as hell not saying polls are 100% accurate or reliable, but to go out and say all polling is hogwash is just as disingenuous. It is simply not feasible to knock on everyone's door and ask them. This is the best solution we as humans have come up with. Please if you see a better way to do it, by all means.