I also think Fiorentina played well enough to win but they could not get win and had to settle for tie. This is disappointing because they needed win to try to get spot in the Europa League. Lazio has tough game against Inter Milan so Fiorentina tie could hurt their chances. Napoli did good job coming back to tie after being down two goals but they have not won in six games which is big concern. They were the champions last season so it is sad to see them struggling. It is looking like they might not even finish in top eight which would be very bad end to their season.
Even though they are not very satisfied with the draw that Fiorentina got at home against Napoli, Fiorentina's opportunity to reach the Europa League zone is still not lost if Fiorentina can win in the two remaining matches this season. I just saw that Fiorentina's last match this season will also face a fairly difficult team, namely Atalanta, who is currently still in the top five, so Atalanta also doesn't want to lose at home because Roma is still a threat to Atalanta, who is currently in sixth position.
I think the priority of Fiorentina now is the Conference League final against the Greek side Olypiacos that will happen on the 29th of this month. They need the trophy more than anything so they can sacrifice one match for that. Fortunately for them, Napoli was not able to win the match even though they scored first, so Fiorentina is supposed to be satisfied with the draw. They still stand a better chance of qualifying for the Europa League next season than Napoli even though the gap is not much. Napoli is not playing anything spectacular so there is no guarantee that they will win their remaining matches.