Training to volitional failure during low-load resistance training does not result in greater muscle hypertrophy compared to stopping a few repetitions short of failure.

Study: Muscle Hypertrophy, Strength, and Salivary Hormone Changes Following 9 Weeks of High- or Low-Load Resistance Training

This study found that lifting light weights until you can't do another rep builds muscle just as well as lifting heavy weights. That suggests you don’t have to push to absolute failure with light weights to grow muscle — you might get the same results even if you stop a little earlier.

Study: Low-Load Resistance Training Performed to Muscle Failure or Near Muscle Failure Does Not Promote Additional Gains on Muscle Strength, Hypertrophy, and Functional Performance of Older Adults

The study found that whether older adults trained until they couldn't do another rep or stopped a few reps early, their muscles didn't grow much either way — so stopping short didn't hurt their results.

Study: Muscle Failure Promotes Greater Muscle Hypertrophy in Low-Load but Not in High-Load Resistance Training

When using light weights, pushing your muscles until they can't do another rep gives you much more muscle growth than stopping a few reps early — so stopping short doesn't work as well.