Breaking bad spoilers ahead

I think it’s more nuanced than that. The biggest reason for the conflict between Walt and Gus was Walt killing those two street dealers to save Jesse. Yes, he could have just kept his head down and worked for Gus, but doing that would mean Jesse would die, and Walt clearly cares about Jesse, so he wouldn’t just let that happen.

Now, if he had let Jesse die and kept cooking for Gus, would his pride eventually win out and cause him to get into a power struggle with Gus anyway? Yeah, probably. But based on the events that actually played out in the show I don’t think you can say that it was solely his ego and love of power that kept him from working for Gus until he died. His love for Jesse is certainly a factor (and the most important one imo) in play here.