What do you mean "nothing like the physics stuff"? That's the entire point of the comparison. The way everything is destructible but also the different materials and their various effects is why people compare it to the new Zelda formula. There's nothing comparable in Oyssey but there's some similarity with BotW "chemistry" engine.
Also the climb everywhere mechanic, the more action/adventure/actionrpg elements like the health and damage upgrades, the clothes modifying your stats, the camps where you can sleep to recover, the way some ruins are hidden like shrines... It's clearly a mix between Odyssey and BotW.