World Cup teams would not consider that new race stock skis direct from the factory are sufficiently prepared for training or racing - they would routinely do a tuneup on the skis before they were used the first time - and then do a tuneup after each day's use.
Of course, what the rest of us do may be an entirely different matter. If the base looks good on a new pair of skis, I'll probably just do a little work on the edges and wax them, and then ski them until they need a light base grind, which is usually only at the beginning of the next season.
After that, all they get from me is a hand job on the edges and waxing for the rest of the season. Since I want my skis to last as long as possible, I avoid doing too many base grinds which removes material.