Charlaquin
Goblin Queen (She/Her/Hers)
I mean, the monk would be better off attacking the dragon’s AC, and spending their Ki on Flurry of Blows and/or Patient Defense, if they don’t have the ability to target its Dex.Speaking in terms of the party, that is true.
Speaking in terms of the party monk, however, it is not. Most monks can't throw lightning bolts or cause effects with saves that target Dex.
Typically, games are played with each player controlling a single PC (or maybe two), rather than an entire party. I believe it's worthwhile to consider how this could impact each individual, in addition to the group as a whole.