Thoughts on going till failure?

If I’m doing like 25 reps for… let’s say bicep curls, and that’s how long it takes me to be at failure for that set, and I do 2 sets till failure, is that a sign I need to up the weight? My thoughts are that if I up the weight, I might sacrifice form, which I don’t wanna do. Also, I wouldn’t do 2 sets to failure, right? I’d probably do the 2nd set till failure, or would I do both sets till failure?

Do I go till failure on every workout, or just choose one workout to push myself on while I maintain everything else? Chris Bumstead thinks of going till failure to achieve growth, though I’m hesitant to believe that.