I don't think yesterday final was a lucky break for unai simon, But statistically, spain was very difficult to beat and didn't concede many goals. Unai simon Performed brilliantly, supported by a Strong defense, making him worthy of the golden glove.
Emiliano is also undoubtedly the best goalkeeper. He won the golden glove in the previous world cup for his Impressive performance leading argentina to the Championship. However, In this Final, He couldn't withstand the pressure from spain, which resulted in their defeat.
For the 2028 world cup, I think emiliano will remain in goal for argentina, As he postponed his retirement after failing to lead argentina to victory in this world cup.
But still that is lucky because from all players, Unai Simon can performed well and supported by a solid players from their team. If Unai Simon don't have luck, even he support by all players in the team, he will not get that.
Emiliano also perform well although his team lost in final but I am sure that will gives more opportunity for him to be hired on the top clubs. I heard Emiliano want to play on Juventus after World Cup with a high cost transfer.
The World Cup effect gives more opportunities to players improving their skills by play on other clubs. They can open their broaden horizons which will helps them to improves their skills.