Sometimes I've been sick, or I've not been up for DMing that week 'cause burnout. I'll try and get someone to take my place for that week. They hate it.
My players at both tables either can't or wont DM, and when people who aren't me, DM, there appears to be a lot of complaints, and those DMs then refer back to me - even though I'm a player - on what I would do. "Can you do it like [Cheesegear] does it?" has been heard more than once.
I also have a direct quote; 'If you [me, Cheesegear] weren't our DM, we wouldn't play D&D.' from one of my tables.
Not everyone has the same creative output,
Not everyone has the same understanding of the rules,
Not everyone has the ability to multi-task and have the agile thinking that wrangling 4-6 players onto a task, requires.
Ultimately, the key is consistency, and when you have rotating DMs, the likelihood of your table not having consistency, goes up.
I am a Forever-DM. The only time I get to play a character is when they're a hostile. Which means I might only ever get one scene with them.