This is similar to complaining that we don't all have the opportunity to spend 8 hours a day doing backbreaking farm labour after the agricultural revolution - it is only important to have people labouring if the labour is achieving something useful.
Labouring for the sake of doing labour is stupid. If robots can do it cost effectively, they should.
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For one, people need to feel like they have something meaningful to contribute. Work is an important part of that. For two, people need to be able to make a living, and work is an important part of that.
It's all well and good to say that people shouldn't have to do menial labor. But unless you have something to fill the void, it's going to be a bad time for everyone involved.