Concerning scouts and deployment, your experience is interesting. I would be interested to know if IG and/or Tau players deploy similarly. They play the main targets of a putative deployment zone attack.
Concerning hiding artillery, how many artillery formations are you considering in your examples? Your arguments make some sense with 1 artillery formation but not with multiples.
If, as Eldar, you are only facing one artillery formation, I fail to see the big problem VS would solve. It is in the case of multiples that you must handle the issue or die.
Now concerning the complexity of the plan, it is really quite typical of Eldar play:
A couple mid range assault formations (SH, Wave serpent mounted troops, Vypers, etc.)
A couple long range assault formations (Storm serpent troops, vampire raider troops, SH, etc.)
3-4 prepping fire formations (Scorpions, Falcons, Fire prisms, Void spinners, etc.)
A couple scout screens (rangers, rangers, rangers, rangers, rangers, rangers and rangers

omg no WW?!?)
A couple close support fire formations (guardians, Vypers, falcons, etc.)
There you got an Eldar army. And with pretty much any combination, you will play it out so as to minimize 1st turn damage from the enemy, maximize 2nd turn damage to the enemy, use superior speed to grab objective and win on turn 3.
If you want to do a full assault on the enemy in his deplayment zone on turn one however, you most definitely can, and you really dont have to use the Void spinner. If anything I really think the Ulthwe SR5, which I would be in favour of removing btw, is much much stronger than the option to have a 3 BP 250 points vulnerable artillery piece.
As I stated earlier, I think VS a fine unit. It accomplishes its intended battlefield role pretty well, and Eldar have to build a battle plan to accomplish a better result with alternative formations. VS are however, by far, not necessary for a successful Eldar battleplan, and definitely not the *
only* unit to threaten enemy deplyoment zone on turn 1, which is what you stated as a reason to pick Biel-Tan and work from there.
Finally, because this is what these last few posts were about, I definitely not think VS should see a price increase. I rarely field them nowadays as they lack punch compared to similarly priced Eldar formations, and because of the *
free lunch* they give the enemy on turn 2 onwards.