Can challenging a party leader be seen as a healthy way to bring about change, or does it simply create unnecessary division?

I think it can be healthy but the fact that Republicans cannot show a united front is concerning. They ousted Mcarthy and then were not able to get a speaker voted in until Johnson. I think she (MTG) should back down and support the Republican leader in the House. While challenging leaders is a good thing, there can be too much division in a party, and right now they are at that point of if they (the Republicans) continue to attack themselves then nothing of value will get done.