He probably cant find those Diamond Veins that everybody else finds randomly.
You should at least wait until you see how the alumina processing works before saying that it feels forced. There will always be changes and additions that alter the Gameplay a little. I might even also change the Shredder later if that really turns out to be a general problem.
The easy Gem cutting into Plates was never supposed to be an earlygame part at all (it was actually more of a workaround for people who don't have GT6 Worldgen), that's why I made the Gem tipped Steel Pickaxes for example, to have the ability to get Gem Tools easier, once you can work Steel. I might do some other Gem related things aswell later.
And as I said the "LV" Buzzsaw won't use Aluminium in it anymore, and can still be used to cut most things, just no longer Gems into Plates.
The Aluminium Production itself was a nerf that was coming since ages, just like the Titanium one. I always wanted to at least somewhat mirror the IRL processes of getting them.
I still like a flexible earlygame where nothing feels grindy, and that is still my vision, that's why I made those Ore bearing Rocks, so you can find most Veins easier. I just have to filter things that are actually not even supposed to exist in GT6 at all into the lategame, what is harder than you think it is. This Buzzsaw thing just reminded me of the Gem Plate thing.
There is still plenty of things I would like to add to the earlygame, I just didn't have the time yet. Technically even Bumblebees count as earlygame, if you are smart enough to use them right. Even though some have a way too high Lifespan to be bred on anything other than a Server. There is still ones that only take 1 minute to die off if you are lucky.