Rhenny
Adventurer
I always mess up cover. I started 4e where allies don't provide cover. Then Pathfinder where there are so many cover penalties range is nearly useless. 5e back to cover, but much more reasonable, and for range focused characters they even give you a bonus to negate allies' cover, plus feats to ignore it.
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Definitely. People who play lots of different rule sets tend to get mixed up more often. I remember during the playtest, sometimes it was hard to remember which rules I was using and which rules were replaced/changed. Switching between 2e, 4e, 5e, Pathfinder, etc. does make it more difficult to keep focused on the RAW.