As others have said, it is purely a personal choice. We had one for 12 years in our previous trailer, and it got used twice in that time.
I do lots of baking in our BBQ. It works great for that. I have done up fresh bisquits to each with our meals, cinnamon buns, chickens, pies, mac 'n cheese (served at the rally), and more.
An oven can certainly hold things, but the space it takes up would hold 4-5 times the volume (just a guess).
But, like any options for our trailers, or many of those in other aspects of our life, if you buy it, and make good use of it, it is a worthwhile purchase.
There is no right answer that works for everyone. As long as you are getting out camping and having fun, these decisions are somewhat moot, as you will still have fun regardless of how you outfit your trailer.
2017 Escape 5.0 TA (someday soon, I hope
2015 Ford F150 Lariat 3.5L EcoBoost
2009 Escape 19 (previous)
“Most folks are about as happy as they make up their minds to be.” — Abraham Lincoln