I think this assumes non-physical agents:
An agent who could physically drive, clean, cook, do laundry, or physically shop for me would be meaningfully life-changing.
But yeah, if it's just software? Current agents and being a programmer already picked most low-hanging fruit.
The flaw of this is most people just don't have interesting enough lives for an agent to engage with. They go to work. They go home. They buy a few things. They have a day on the weekend to walk around the block. They take a trip once a year
There's not much slack there. What's the agent going to do