What's the difference between getting to an FA Cup final and getting to the Playoff for the Champions League?
If you win, you win. If you lose, game over, may as well not done anything.
Both are an event, a one off winner takes all affair, yet the Playoff offers significantly more financial reward than the FA Cup and significantly more European prestige and momentum for the club overall.
So other than a day out at Wembley and a p*ss up for all involved, what is practically so important about the FA Cup - given you're advocating having a go at that but laughing off trying to get fourth place in the league as a "hurdle".