Sure, it would be nice to have numbers. But, Elon and the board really don't know what the future might bring, do they? Especially after dealing with last year. Their recent experience with just what sort of unexpected things might happen (despite how they did what they intended anyway) is a lesson learned.
No representative of any growing company, particularly one where the media have a habit of ripping them up over minor deviations, is going to express in any concrete terms what they are expecting.
A friend once told me, "You get what you inspect, not what you expect" and I believe this is doubly true here.
Sure, folks are gonna gripe, and as SMR says so often they'll have to think and "thinking's hard" for many of them. So why give the kiddies matches to play with and send them out to the hay barn?
The disappointment of these whiners is much better for the SP than the grand strokes at negativity they would spew given a little more information to spin.
If you are concerned about how not telling them will affect the SP, give some thought to how telling them has affected the SP in the past.
Tesla is once burned, twice shy, and I support their decision to not feed the Trolls.
Let them do the hard work, or, just put in some effort watching Tesla Daily and other folks who are giving them more precise numbers.