I'll assume you're being serious. It is 100% not going to be more powerful than a 1080 ti because in order to do that it means it would have to be AT LEAST on par with V64 OC & make great use of all the new Navi features, all while being a low cost option. It should be clear from the slides that Sony is focusing on cost & spread rather than pure power, so anyone expecting a hardware behemoth for the PS5, will be disappointed. It would be a great achievement for them to get something like V64 hardware (not performance! that can be better due to optimisations & software progress) in the PS5 in the first place, but even that won't be enough to rival a 1080 ti on desktop.
No. If you look at current consoles, for example, X1X, that has a somewhat RX 580 equivalent in it and the games themselves run more or less like with a 580. [Ex:
Rage 2]
Yes, for first party titles there's some extra to be squeezed from the hardware purely because the games are made exclusively for a single platform, but that's not going to translate into the same gains for cross-platform titles. That's why I say, that, if PS5 GPU has the hardware capabilities of something like a Vega 64, then AT BEST it will equal a 1080ti in terms of results but ONLY for exclusives.