Yes, the Trinity Force does have a ton of benefits but wouldn't you rather have higher stats over multiple items instead of one with many weaker stats? To me the idea of building is so you have great stats with multiple items. I suppose you could buy 5 Trinity Forces but then the Passover go to waste and the output multiples would still be much higher. 30 AP doesn't add a on of damage but a Rabadon's adds 30% more and 120 AP. It's a great item yes, but there are much better ones that master one ability or something such as Guardian Angel specializes in defence like Warmog's Armor and they have about 10 times the defense as a Trinity Force. Same goes for damage or attack speed item and so in. That's just my rationale. Sorry if it doesn't make sense. I tried to make it as clear as possible
What better champion to have my 1000th win with. 4 digits!!
To me the largest thing going for Trinity Force is that the components to building it up all are really economic and useful. You never have to wait for a long period of time without getting a benefit from the gold you farmed.
But to me it seems like buying a trinity force is like buying a bunch of beginning items just condensed into one item. Wouldn't it be better to not be as economic but not for staggered purchases that add things periodically?