Although they certain have boards with flashy lights, Gigabyte has been my mainstay for stable boards, and they do advertise signal integrity and thermal safety. (They also have a Black Edition of many of their boards, which has extra testing)
Side note, for more capable boards with the features I need I've noticed it actually costs more to get one without built-in RGB. Not sure how that became the premium option now.
Guessing because desoldering is so time-consuming.
The lights are just personally offensive to me. I'm happy to pay more for their non-existence.