For now it's only a rumor based on leaked renders, it could be that the renders simply didn't have all the details. I'd be very surprised if Google really ditched physicals SIM cards as that would definitely hurt sales.
To be fair, most headphone jacks were utter trash so it did not bother me too much, but I used to specifically choose LG because they had built in quad DACs for their phones. I choose a pixel now because it is the best phone otherwise.