Some people forget that D&D isn't like an unattended videogame where players can find ridiculous exploits.
This "problem" isn't a problem, unless the DM creates a ridiculous situation in the first place that allows it to be a problem. People complaining about this being a problem is like when people raised a fuss when the Minion article came up and said things like, "but level 1 players can go find a level 20 minion and get lots of XP if they keep attacking until someone rolls a 20 and deals damage!"
This "problem" isn't a problem, unless the DM creates a ridiculous situation in the first place that allows it to be a problem. People complaining about this being a problem is like when people raised a fuss when the Minion article came up and said things like, "but level 1 players can go find a level 20 minion and get lots of XP if they keep attacking until someone rolls a 20 and deals damage!"