
Is an extremely late-game build.
Main thing to consider with RoA+Archangel's is that you're average income in an average game is ~11,000 gold, which works out to roughly 3 major 3k items, 1k in boots, and 1k in the bank when someone's Nexus explodes.
Applying that to an average game: If you get RoA as your 1st major item, it won't be fully stacked until you complete your second major item and ~2/3rds of the game has already passed.
With Tear: the struggle is fairly real to stack Tear in 10 minutes with Viegar. Even with sneaking Tear in before you finish RoA, you're looking at both maxing out closer to ~30 minutes.
Average game only lasts ~33 minutes.
Granted: RoA and Seraph's Embrace are extremely cost-effective at max stacks, but either way you're sacrificing a considerable amount of early/mid-game presence with a late-game or bust strategy with RoA+Archangel's.
Considering Veigar's late-game is going to be strong pretty much no matter what, I'm inclined to belive focusing on an early/mid-game power-spike where you can really set the pace for your team from mid-game would have a much greater impact.