@smmenen Well, people can definitely play what they want more often on MTGO than anywhere else (besides 100% proxy and cockatrice, but for sanctioned, competitive play it's MTGO).
The other thing is that card availability on MTGO is instantaneous. Let's say I play one of my terrible brews and get frustrated with the results. Then I see how Thiim's awesome MUDrazi deck has been crushing people. So I add my entire deck to my trade binder, get a few hundred tickets, and buy Thiim's deck card for card. That process is as quick as five minutes (if you want to scout the best deal it could take longer).
This makes the case for paying attention to MTGO results as a barometer of the health of Vintage stronger, not weaker. Less stickiness in deck selection implies a "truer" representation of metagame composition and health of the format. The fact that Shops are so expensive on paper suggests that their actual metagame representation is artificially suppressed, especially in paper environments, relative to non-Shops strategies. That MTGO has greater substitutability generally makes it all the more remarkable that Shops are dominating.