to be chafoin wrote: Mh mh, but does not this lead to an earlier and stronger fragility in the face of drought, when the lack of water (probably unavoidable) arrives?
My answer was incomplete. You're right to raise.
From a "root development on the surface" point of view, I think (but this is only a conviction) that this will not change much. The tomato will go where it finds food (and as I said, bacteria and mycorrhizal fungi probably too).
But you are absolutely right about the fact that the tomato produces "adventitious" roots (roots that grow on the stems). The more stems you put in the ground, if necessary by laying the foot down, the better the plant will be rooted - or even, no doubt (but I'm still guessing), mycorrhizal - and therefore resistant to drought.