Aggressive Bonding for Half a Premolar Tooth, Recent Fracture and Dead Nerve Due to Decay Under Filling? (photo)

Some dentists say bonding 'won't last' or not worth doing for my 1/2 premolar. I'm not concerned with appearance, but how do they shape the top to mimic a real tooth? Would it last less time being large? How long should it last? Bonding buys time to see if root canal treatment needed. I don't see logic in RCT on a problem-free tooth. Seems better to do RCT 1st time in a few years if infected, rather than redo RCT in a few years. RCT doesn't last forever. Do you suggest RCT before bonding?