Because it then becomes a classic case of "It is fine only when it works". Which may or may not be the case. Especially if it boils down to the players attempting stunts the DM did not expect, and may not be able to rule appropriately.
For example, athletics checks may not be feasible on the fights decked out in fullplate. Readied actions are kinda moot when the dragon is out of reach anyways. As pointed out, while melee PCs can still use ranged weaponry, they likely won't be too good at it. Teleporting on top of the dragon is innovative, but its effectiveness also depends on how the DM opts to adjudicate it. What if positioning strike misses, or the rogue did not take it? Or if the party meets the dragon in the open wilderness, and do not have a disk ready?
All in all, presenting a normally impossible scenario and expecting the players to get out of it somehow may not always be feasible. In the very least, you need a contingency plan for if/when things go wrong. What happens if despite the party's best efforts, they still cannot injure the hovering dragon meaningfully, while it is unusually lucky in recharging its breath weapon and is able to to use it more often than what you would normally expect? How do you rationalize it forsaking such a winning strategy in favour of one that is clearly suicidal and obviously aimed at nothing more than giving your players a fighting chance?
All this should already have been ironed out before the DM even ran the encounter. He should know what the party will be getting into, in the very least, and not assume that they will be fine somehow.
For example, athletics checks may not be feasible on the fights decked out in fullplate. Readied actions are kinda moot when the dragon is out of reach anyways. As pointed out, while melee PCs can still use ranged weaponry, they likely won't be too good at it. Teleporting on top of the dragon is innovative, but its effectiveness also depends on how the DM opts to adjudicate it. What if positioning strike misses, or the rogue did not take it? Or if the party meets the dragon in the open wilderness, and do not have a disk ready?
All in all, presenting a normally impossible scenario and expecting the players to get out of it somehow may not always be feasible. In the very least, you need a contingency plan for if/when things go wrong. What happens if despite the party's best efforts, they still cannot injure the hovering dragon meaningfully, while it is unusually lucky in recharging its breath weapon and is able to to use it more often than what you would normally expect? How do you rationalize it forsaking such a winning strategy in favour of one that is clearly suicidal and obviously aimed at nothing more than giving your players a fighting chance?
All this should already have been ironed out before the DM even ran the encounter. He should know what the party will be getting into, in the very least, and not assume that they will be fine somehow.
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