I totally agree @Homaclese! Every player in the game has an area of they game they focus on more. Thus, that will be where they will (or at least should) limit break their heros. For me, I focus on wars and titan scores! I’ll probably focus on my war defense heros with a close eye on those heros that I also use on my various titan teams.
Next year, I plan to do @Razor’s Raid Wars contest. Thus, I’ll work on limit breaking my main defense as we near the contest. In my book, I view limit breaking a hero with the same mindset as I have for emblems - main/war defense, titans, raids. The only difference is that (at least for now) you can’t reset a hero that you have applied limit breakers on, so you have to put more thought into which heros you will do first. Hopefully, they will have a reset option in the future for heros you have applied limit breakers to especially IF they start rolling out 6* heros!