First: If Tesla opened for putting down deposit today, the media would just say that Tesla is so desperate for money that they even let people pay deposit for a car that they don't even have a prototype for. So no, Tesla should definitely not open that wormhole until they have shown us the car.
And then - if I did put down a deposit today, about 2 years before the production start (if it's not delayed), how much earlier will I get the car comparing with on that reserves the car let's say 1 month before production start?
- I will NOT be ordering a signature. So far "Founders" and "Signatures" are first in line, even if they get in the line just month before production start.
- I live in Europe, and so far it seems like the European marked will only get they cars until the reservations in NA is more or less "used up". A car reserved in NA one month before production start may very well get their car before me.
- I will NOT be ordering a "P110Q" with all the bells and whistles. So far it looks like Tesla is prioritizing it's deliveries on price/options. A "P110Q" ordered in Norway one month before production start may very well get their car before me (if I order a "bare bone" car).
So the value of "an earlier production slot" is rather questionable for me - even if I want that car delivered ASP! Preferably yesterday!
... but I would probably put down my deposit as soon as I can anyway