Conventional gas lift (with valves, mandrels and a packer) was developed for vertical high permeability, pressure supported, limited drawdown conventional wells with high/increasing water cuts, low/decreasing GLR’s.
No wonder it is not optimal for most unconventional wells. Common sense and systems nodal analysis show that injecting gas in a different way is better.
Single point gas lift (SPGL) with high pressure gas (if needed) and no valves, mandrels or packers, can remove the constraints of rate and flexibility/ drawdown limits which plague conventional gas lift as well as making it easy and inexpensive to move to different artificial lift methods in the future.
Come look at the evidence and compare for yourself.