We have a few questions about dispel magic that arise as a consequence of dispel magic dispelling every effect on a creature. Although situational (>1 negative effect, at least 1 positive effect)1, sometimes you want to "intentionally fail rolls" (Can I choose to fail the ability check for Dispel Magic?), sometimes you would like a specific effect to be targeted first so it has a higher chance to fail (Who decides which spell gets dispelled first?), etc.
My point is: this seems to overcomplicate things.
If instead the DM chooses to let dispel magic select which effects will be dispelled, will there be any game-breaking or even considerably unbalancing mechanical consequences? Will it allow some Pun-Pun level of cheese? Will I have to throw a Tarrasque into my players so I can fix my own mistake?
1 It also might work as an enemy spellcaster dispelling buffs without dispelling the curses, which would be >1 positive effect, at least 1 negative effect.