If there is a certain restaurant you must eat at always make an ADR as soon as you think you might need to. We don't have a hotel resv. yet for our July trip but I already have ADRs for some meals! And yes, one of them was Le Cellier.
Some restaurants are always hard to get into. I have seen many turned away from restaurants in Jan, Feb, Jun, July.
I think it is totally fair for folks who plan ahead to be able to make their ADRs. First come, first served. If they made us wait until 2 weeks before our trip, the phones would be jammed constantly!