Originally Posted by
Oracle
That's not the point. The fact is it takes too long to get that. It creates a 12-20 minute window where you will be around an item or half an item behind your lane counterpart. In that time, the amount of gold you lose from less map pressure counters any gold efficiency one item provides.
Using your logic, you can justify always buying mejai's and soto. It's not the 20 AP or 10 AD, it's the fact that when you get 20 stacks you get 15% cd reduc and 180 ap for only 1200 gold, or 15% ms and 110 ad for only 1200. Doesn't matter that it takes a couple kills to get it, what matters is that when it happens it's totally awesome.
You also have to look at the reliability of the item. Averaging 10 kills per game for full stacks on mejai's or soto? Very hard to pull off. Averaging 15 minute games, easy peasy.
Also, easy way to not lose map pressure, just have wave clear. If you have any sort of wave clear you can hold out on your objectives for long enough for your item to hit a power spike. Or else, just have a team that can shelter you relatively well.
Point is, you say it as if muramana and archangel's are never viable. They aren't that difficult to pull off correctly, and they both have extremely strong passives that can be game-changing if used correctly.