so I don't know any of the differences created by playing against players that you can identify. Other than the lack of a HUD I don't see how it would be much different.
Really you can't picture it?
Try picturing this >>>
You're at a live charity tourney at the local casino on a Saturday. This particular tourney brings out all sorts of players ie. some who are regulars at the casino, others who might be playing live for their very first time due to the nature of the event, etc. etc.
Can you picture the difference of playing these players if all of them were wearing a paper bag over their heads & a large garbage bag over their torso vs. being able to see each of them?
4hours into the tournament, you've been moved a couple times and now you're facing a 3bet from 'paperbag-head'... what range do you put them on (lol).
You're in the same tournament the following weekend... you've been moved a couple times and now you're facing a 3bet from that kid with the
pokerstars jersey on... the same one you saw 3-betting light & often at around the same stage of the tourney the month before. Oh wait! You look closer after removing what felt like a piece of a paperbag stuck in your eye and now you see it's actually that 80yr. old granny who only 3bets AA/KK
Are you able to see a difference now?