They're supposed to be default, they're gonna get used in promo material, cinematics, illustrations, everywhere, but they're not actually defaults since they don't come by default, hence the quotations. Not considering their current look in the current time frame their default look seems like mental gymnastics to me.
And I don't think it's contentious, anyone would assume they're included in the free PvP mode and not paywalled by the PvE. I tried asking a few friends that play OW and they were surprised as well when they found out. You're most likely gonna have to pay actual money this time for all of the other skins, you'd never think even the base skins are paywalled.
Btw, we're still talking about the PvP as a free upgrade for OW1 owners but it's pretty much guaranteed it's gonna be free for everyone anyway.
Yeah, but if we're thinking about this from the perspective of people getting into Overwatch for the first time with OW2, they're either going to buy the full game based on the marketing, or they'll get the PvP for free and find that the (let's be real) mildly-moderately altered OW2 default skins are locked behind a purchase. Is that really a deal-breaker? There's so many new things coming for free that I cannot help but think these future F2P Overwatch newbies aren't going to think much about getting a different set of default skins. To reiterate my previous points, new defaults locked behind a purchase of the full game does not seem like taking away something from F2P players, it feels like a premium incentive to try the single player - i.e, a bonus.
And yes, I agree that OW PvP will shift to F2P. But given that current OW players are expecting to receive new heroes, new maps, new UI, new systemic changes, and so on, as well as getting to keep their old skins, I find it hard to think about many players being like "what the fuck do you mean we don't
also get the new skins??!" OW2 serves as a jumping on point for both old players and newcomers, so it makes sense that they get access to the same content as each other, but it makes less sense for them to get premium cosmetics as well. After all, they're paying the exact same price of nothing to play PvP.
The base skins are not paywalled, but it seems like your sticking issue is that the base skins are what currently exists in OW right now. Additionally, I disagree with the idea that all future skins will be paid. I think even a battlepass system will have a free track and will likely include some free skins, even though they might be only rare/epic tier.