Driveway paver size 40x20x8mm okay?

We have laid 40/20 pavers. This is not an unusual size in our construction area. It was also not a big problem to install. Even larger ones (although I don’t find the 40/20 that big) eventually become too cumbersome to lay by hand. With smaller stones, you then have other problems, especially regarding the flatness of the surface. Our neighbor has stones about 7/7, which were laid by a landscaping contractor, but it doesn’t look particularly even.

Why should that be a problem if done professionally? Whether something sinks or not depends on the substructure. If that’s rubbish, a 40x20 will sink just as much as a 20x10. Our sidewalks and driveways in this development, using the usual sidewalk format (20x10 or smaller), are perfect, even though 40-ton trucks sometimes roll over them. If it’s not laid evenly, you have to give the landscaper a hard time... but it certainly isn’t the stones’ fault. The opposite is actually true. Smaller stones tend to compensate for unevenness even better.

I would rather mix such large stones. Like in the pictures from Kann or at least always alternate the rows.
Have those who consider it trouble-free laid the stones themselves?
We laid 60m² of 30x20 ourselves and after halfway through I would have preferred 20x10. Sure, that means more, but you can no longer lay the 30x20 with one hand and they are simply more difficult to handle. I don’t even want to imagine what it’s like with 40x20.
So, a problem, in the sense of not doable, of course not, but I would say it’s additional effort. And I would have that paid for separately as well.

40x20x8 weigh about 15kg. That's a crate of water...