I think we fundamentally agree, just different semantics. Computers increasing people's efficiency led to workload increases because people are expected to do more (as you say, cutting a business response from a week to seconds). Some jobs were/still are being outright replaced by software -- which isn't necessarily a bad thing, we just need to secure ways for people who are replaceable to still continue in society, but unfortunately that is a very optimistic take
Unfortunately, it is about personal competition.
1980s trading was carried out in a pit, trading moved into electronic, fax machines green screen computers, then moved into digital age with servers farms buying selling in milliseconds, market profits on minimal price movements frequencies.
Tie this in with information speed and having better knowledge than the next investor, would increase the probability of having better profits and possibly reduce the risks of risker investments that would have a higher payoff from a risk free rate less say.
This is one reason why we are having so many market crashes or mini crashes.
Look at the jobs, quant guys were hot property 2000s. Later you need quant and programming now it has moving to A.I.
A person with a Msc in finance or MSc financial engineering combined with a MSc in data science which contains A.I
From top 10 global university.
Can command 200k to 500k wage in the US at the moment. Even in China they are pay huge wages for that combination. Now you look at the UK the money is just pocket change compared to those countries.