Maybe Jose Mourinho really believes the strategy he used to apply and was quite successful in previous matches will also give good results
It worked fine just before an own goal from Mancini. It is unlucky for Roma and lucky for Sevilla to have that goal. As without that lucky goal, I don't know will Sevilla can break Roma defense.
not preparing his team for the worst scenario, namely penalty shootouts because penalty shootouts often make any team even when they are considered the favorite team will be seen very weak in penalty shootouts because it's also very mentally involved and a lot of good players fail as penalty takers because the pressure is so great in games like this.
I don't think Mourinho wanted to solve this final in penalty shootouts. In last 15 minutes, he sent some attacking players in to find a winning goal but those minutes were broken into pieces with injured time. I think Mourinho wanted to keep Matic for penalty but the player just failed to stay till the last minute. Same for Pellegrini who was replaced because he was too tired.
El Sharawy can be another player who shoot for Roma but his turn never comes.
But it's true what you said when the match was only done once so he should as an experienced coach be aware of unexpected things that might happen such as a match that must be decided by a penalty shootout, it's a shame Rome's first 3 kickers failed so Sevilla whose players perfectly executed it could become European league champion.
Mancini is a good choice for penalty in theory but he failed and I only disagree with Ibanez who should not chosen for penalty.
But I don't really agree with the word luck because what Sevilla achieved was because they fought and again the opponent didn't take into account what they could do in the final.
Sevilla made good penalties and they deserve to win in penalties but if look to 120 minutes before penalties, they were lucky. Roma deserve to lose because they shot penalties too bad.