Yes, I pointed out in my review that actors trying to make themselves heard through masks was a “thing” with Christopher Nolan. Practically a fetish.
Yes, there are plenty of other places we can’t hear what the characters are saying to each other. Best reason to wait and watch it at home, really the only reason, is closed captioning. It’s a big movie, needing a big screen. But don’t expect to make out every line. Nolan must be embarassed by his way with dialogue.
Here’s Variety reporting that “Tenet” audiences are complaining “that the dialogue is inaudible. Is Christopher Nolan making an artistic choice or is it a mistake?” https://t.co/vvRFzNbyc1 https://twitter.com/Variety/status/1301155332660563968?s=20