Hypertrophy - lift to failure or not?

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For as long as I can remember I've done the typical pyramid style sets to failure. For example, bench press would look something like 4 sets starting at 10-12 reps, adding weight to each set and fatiguing the muscle to absolute failure at about 6 reps by the last set. Sometimes incorporating forced reps, negatives, drop sets, etc. This worked great, all good stuff. However, I'm realizing I haven't made any gains in muscle mass in a really long time.