It is obvious someone has already come up with this idea, but I want to raise this topic anyway.

Why do mid-tier basic items exist without being built of something weaker?

I am talking about items such as Chain Vest item Chain Vest or Giant's Belt item Giant's Belt. Why are they bought in the shop just as they are instead of upgrading from something less expensive?

Let's discuss build paths:

Ruby Crystal item Ruby Crystal -> Giant's Belt item Giant's Belt

Cloth Armor item Cloth Armor -> Chain Vest item Chain Vest

Null-Magic Mantle item Null-Magic Mantle -> Negatron Cloak item Negatron Cloak

Long Sword item Long Sword -> Pickaxe item Pickaxe -> B. F. Sword item B. F. Sword

Brawler's Gloves item Brawler's Gloves -> Cloak of Agility item Cloak of Agility

Dagger item Dagger -> Recurve Bow item Recurve Bow

Amplifying Tome item Amplifying Tome -> Blasting Wand item Blasting Wand -> Needlessly Large Rod item Needlessly Large Rod

Of course this leads to increase in upgrade stages, but makes the game a lot more smooth and logical when the greater is built from lesser. Everyone has experienced clumsy situations when you are pressed hard in lane and must buy something but lack 200 gold for it. You neither can wait in base nor go fighting because the enemy has bought B.F. and has a lead now.

Those advanced items which require the weakest basic items will still require them. But items like Infinity Edge item Infinity Edge will have extended build paths.

Infinity Edge item
Gold 3800 (Gold 645)
B. F. Sword item
Gold 1550 (Gold 675)
Pickaxe item
Gold 875 (Gold 515)
Pickaxe item
Gold 875 (Gold 515)
Cloak of Agility item
Gold 730 (Gold 330)

P.S. Those templates. Using them first time.

Danz The Pure Ffuu