I... disagree with everything you just said there, but I'm also getting sidetracked again.
. if we go with my proposal to have holy weapon worth a little shy of half holy arms,
...Then we can indeed balance things out so that our Tier 1 spells are totally functional next to our Tier 8 spells, balancing out that half/double impact with research time, later availability, and, of course, what I can only imagine will be much, much, much, much higher casting costs.
Call that done and let's pretend it all makes sense when we're done. You haven't touched on;
Why does anybody still care to reach for Tier 8, if we do this?
If our Spell Tiers are balanced against each other so that a Lord with only T1 and 2 spells isn't at a disadvantage compared to a Lord with T7 and 8 spells... then they are by definition not balanced against the Disciplines, which are outside of that.
Right now we have three possible choices when spending a Build Point:
1) Additive Spell Circles, that build up to higher Tiers1a) In one Spell Circle, leading to several spells in each Tier, or
1b) Crossed Elements and Effects, leading to a single spell in each available Tier
2) Non-Additive Spell Circles; Elements when you already have an Element, or Effects when you already have Effects, which don't combine for higher Tiers at all;
and 3) Disciplines.
You can force a balance between 1a and 1b by flattening out the Tiers so that having 16 spells in Tiers 5-8 isn't so much better than only having 4. You can even force the balance between 1 and 2 by flattening them out more, so that having any T8 spells isn't really an advantage over having only 1s and 2s. But I don't think you can balance all three as they stand. They're contradictory.
MoM had, basically, 2 and 3, depending on how you look at it, and that's easy... choosing Retorts meant giving up higher level spells, and their Rare and Very Rare spells were awesome. And that's what made it interesting; "I want Channeler, but is it worth giving up two Chaos Books?" "Do I want to take all eleven Life, or settle for nine so I can snag Divine Power?" "OK, my Myrran Warlord probably isn't getting Crusade as it is... but do I want to give up that last slim chance at it, or do I want to add Alchemy? Alchemy is pretty awesome with Warlord, but Crusade is better. Argh!" "A couple points in Nature would really shore up some of what my Death Magic is lacking, but...then I'm not `really good' at either."
Etc. Always a tradeoff, but always an interesting tradeoff. And still, people tend to agree that it was better to push for the high-level spells than to diversify your magic; Life8 was better than Life2/Chaos2/Nature2/Sorcery2.
If our Tier 8 spells are barely better than our Tier 1s so that a Lord with only T1s and 2s can keep up with Lords with a handful of T7s and 8s each... there's no tradeoff. The Disciplines are always better.
if we go with my proposal to have holy weapon worth a little shy of half holy arms
My other problem with this, is that we're totally throwing away Epic. MoM's high level spells were absolutely Epic. Zombie Mastery. Armageddon. Crusade. When just one of these came out, it changed the game, and felt awesome!
We can't make Alacrity `about twice as good' as Full Sails, and have it feel Epic. Full Sails is not halfway to Epic. Frankly, neither is Holy Weapon. Holy Arms, in MoM, was. In WoM, it doesn't have to be, I guess, but I liked it that way.
Soo... can we balance our Spell Tiers against each other so that having high-Tier spells isn't an advantage over having only low-Tier Spells? I'll take your word for it, so OK - yes, that can be done. Might it be possible to squash the Disciplines down so that they, too, are in line with capping everything at about Tier 1 for impact? I suppose it probably is.
So I come back to my real question: Is that really the balance we want? Are we seriously planning to just throw away "Epic" in order to avoid taking a harder look at our spell selection system?
Tranquility is... nice. Should Crusade be, "A Little Bit Nicer"? Is that the Crusade we want?