Also pc games mandatory mechanics and tabletop mandatory mechanics are different. In a pc game mandatory effects simply take their place but in x-wing one person might forget his upgrade cards like r2 astromech or rebel captive which might elude the other player as well.
Then there are also optional stuff like whisper's and fel's focus tokens which are not mandatory, the opponent should not remind people those stuff in tournaments, since a tournament is a comparison of many things, fatigue and knowledge of your own list being two of them.
It's one thing if it's a new player, but experience players should not expect this.
The more skilled player will remember his actions and abilities more than a less skilled player, as it is all part if the game. Along with maneuvering
If someone is serious and wants to win they ate going to go in with their best squad and give their 100%
If someone is just their for fun, they probably wouldn't care so much if they did forget something and just shrug it off and carry on.
In big events that can take 10-14 hours the game will take its toll and wear people out mentally. Only the best will come out on top.
If your having to be reminded to take whispers focus or use gunner then imo your probably not the best.
Maybe early on, they could be, but over time maybe they lack the mentality to stay focus vs other players.
And this is one aspect about tournaments.
It's not just how good you are with your squad, but how focus you can stay over long periods of time.
I couldn't imagine winning an event knowing I probably wouldn't have if I was to be excused for making mistakes and allowed backsies.
I'd almost feel as though I cheated even though that isn't the case