Given the low proportion of people I've extended employment offers to over the years who even try to negotiate terms or drill down into employment terms that might affect the value, I'd assume it applies to most engineers.
At some point I got a week more holiday than every other employee in the UK at my employer at the time because I was the only hire who had questioned a contract clause and gotten them to confirm my preferred interpretation of a woefully misleading clause in writing before signing, and when they later wanted to stick to the technicalities of how it was written I was able to just forward them an email from the COO confirming that in my case they'd agreed to my interpretation.
Most people seem to only pay attention to the headline amount, and then grumble about the consequences after the fact.
At some point I got a week more holiday than every other employee in the UK at my employer at the time because I was the only hire who had questioned a contract clause and gotten them to confirm my preferred interpretation of a woefully misleading clause in writing before signing, and when they later wanted to stick to the technicalities of how it was written I was able to just forward them an email from the COO confirming that in my case they'd agreed to my interpretation.
Most people seem to only pay attention to the headline amount, and then grumble about the consequences after the fact.