Is this true in general? The Silicon Valley company I worked at for a long time started out with ISOs, then as the company grew scrapped ISOs in favor of NSQ (

Is this true in general? The Silicon Valley company I worked at for a long time started out with ISOs, then as the company grew scrapped ISOs in favor of NSQ (nonqualifed options) and then later scrapped those and just gave RSUs. The move from ISO->NSQ had some tax advantage to the company even though it is obviously worse for the employees.