I personally disagree. The events and quests are meant to be completed by players with challenge, but not difficult enough that they feel frustrated or annoyed. Everyone has a different definition of "difficult parkour", so what you may find easy, a player could struggle on for a long time. If players want to do difficult parkour, they have options such as minigames around the map, WizPE, etc., which are not mandatory. At the end of the day, most people do not join a minecraft rp server to struggle at parkour, and some people just don't get better through practice (edit: by this, I mean people with disabilities). People who struggle at parkour shouldn't have to suffer the results of not completing quests, especially when quests are the main source of gold income for new players. Quests are designed to be enjoyed by all players, to follow their storyline throughout time and allows players to enjoy the full Potterworld experience without wanting to give up on the quest, or even quit the server over it.
Perhaps this suggestion could be altered, and ask to include more difficult parkours around the map as minigames?