You are right, there are still many other aspects that you can take a look at if you are playing in a physical casino, but there is no doubt that if people begin to hide their face completely, as I think it is going to be the case for many poker players after this pandemic, then it is going to be a lot more problematic to read your opponents, after all there are already players that go out of their way to try to minimize as much as possible the information they give by not talking at the table unless it is absolutely necessary and this will help them to reduce information that they give even further.
There are lots of poker players who unnecessarily speak about their cards like "Hey, I have got 3 Aces, wanna fold?" and similar distracting statements which sometimes affect the decision of opponents and they fold for real, then later they come to know that the guy was 'bluffing'. This is another way of winning but not effective on those who know about this already. And it is a casino, not a hospital where silence is needed so every player is allowed to speak.
If we play poker, we really have to be good at bluffing, and one of them is with a little saying that disturbs the attention of our opponents.
But we can't do that too often, because I've been admonished to keep quiet when trying to disturb my opponent in this way. Because maybe
my behavior has been considered annoying, even though we know that talking actually is allowed when playing poker. As long as it is not excessive
and disturbs the comfort of others. Therefore, bluffing by speaking that disturbs the opponent cannot be done too often. We've got to blend bluffing
with another way, In conclusion, we have to be creative in bluffing. And it takes practice to be able to do bluffing without suspicion.