None of the improvements of the past you outline were advertised as capable of replicating agency. They were sold as tools. Note that I am not making any claim about actual capability for agency, there’s other people more qualified than me to discuss this. Regardless factuality of ability to replace people, this is how it’s sold and arguably also how it’s bought. This gives the view that it has impact on jobs more weight.

Also I think it is plausible (if not likely) that LLMs reduce the demand for other kinds of software. They're (relatively) general purpose and can handle many tasks that previously would've needed bespoke software (and a team of people to create/maintain it).