Not necessarily, this is what you should do with any sintered base designed for gliding (nordic or alpine). Freeskis and race skis will use sintered bases and the race bases are the strongest, not most fragile- they just require more work to go that fast. But if you don't at least wax any sintered base at least once every 10 ski days, then your base will dry out and you'll need a stone grind to remove that dried layer. Our Punx actually uses a 7000 series p-tex base, same as our commercial race skis. If that base is waxed regularly, it becomes stronger and more durable.
Dirt, oil, gas, other impurities will sit in the structure of the base. A quick hot wax will not push them into base but rather trap them in the wax. So, when you do a hot scrape, it will pull out this junk. You won't hurt the bases at all by doing this.