It does not require much upkeep. That is absolute bollocks. This is what I do to mine.
Sweep leaves off it at the edges - probably takes less than 1 minute to brush the edges only under the laurel bushes. I am out filling the bird feeders anyway, hardly an imposition. But that is only when leaf dropping occurs. If the whole lawn needed doing (rarely, but sometimes after a storm) get the leaf blower out. All that crap would just sit on a grass lawn. All the little twigs, berries etc.
Every 4 months weedkill the top of it.
Best thing about it
No mowing,
no emptying grass cuttings,
no feeding and treating,
no moss,
no mud
no bare patches
no ants
dries incredibly fast after rain
birds sunbathe on it
no grass stains on clothing
no muddy feet
Cons,
it does get warm, but I don't tend to lie on the grass, I have loungers on the patio or garden benches to sit on. Or I throw a picnic rug down.
Some people have disabilities and cannot maintain a lawn, or in Dh's case grass hayfever where his eyes are slits and the ridiculous amount of meds he has to take and weird devices to help him just breathe. Artificial grass back garden means that he can actually be in the garden with his children.
We have 2 front gardens plus a side garden. None of these are lawned, they are planted up but we needed an area for the children to play. Best thing we ever did.