De Boer is actually a more defensive manager than the most Dutch managers.
What happened at Inter was he was brought in to bring a better type of football the club said they wanted to follow. Inter is a team with many older players and he came against the old problem, you can't teach an old dog new tricks and he couldn't get the dressing room to follow his vision. Chrystal Palace was never a good choice. You cannot make flat racehorses jump fences. Palace just never had the players to play his style of football and he never got the time to change things. In today's age Manu would have sacked Fergie at the beginning and missed out on the best trainer they ever had.