The problem the article doesn't address is that the original system of just having 'Software Engineer' and 'Senior Software Engineer' failed to capture the expe

The problem the article doesn't address is that the original system of just having 'Software Engineer' and 'Senior Software Engineer' failed to capture the experience of someone with 5 years of experience moving company. Either you introduce titles below or above. In practice the industry did both - Graduate, Associate, SE, SSE, Staff SSE, Principal SSE.