Most professionals don't bother darning the toe platform at all. They either cut the satin out altogether to expose the hard canvas beneath, or leave it as is and use rosin instead. Studio dancefloors and stage surfaces are not slippery anyway.
Students and recreational dancers do darn them, but that's because they may only be wearing them for a few minutes a week, so it is worthwhile. You can also buy suede stick-on pads. They are learning, so need a bit of extra grip.
Dancers don't smash the shit out of the shoes. They are moulding them to their own specific foot shape, and to their level of technical expertise. They may have an old injury, for instance, that needs additional support on one side of the foot but not the other. They may be a soloist doing a long pas-de-deux sequence and need the shoes to be stiff for all the long balances on one foot. If, on the other hand, they are doing a lot of demanding jumping, then they need the shoes to be more flexible.
Another reason why pro dancers soften the toe box is so that they don't make a loud crashing noise when they land from jumps.
Every shoe is different, even those made on the same day by the same maker with the same materials. Each is treated as a unique thing, and has to be made to suit the dancer's individual requirements.