Railroad AP itemization - Lackluster

I've been a Lol player for quite a long time and this feeling that AP itemization is getting closer and closer to railroad seems to me it's putting a dent to all the mages out there.

Lets take some items that follow this precept of railroading for example:

Lost Chapter - This is an awesome first back item for mages, specially for Ryze. However, if I pick it, the only possible destination is Morello's. Fiendish Codex, on the other hand, can be built into a lot of other items like Nashor's, Banshee's Veil, Zhonya's, etc.

Seeker's Armguard - Awesome AP and armor item for dealing with assassins and melee characters, but it only ends in Zhonya's.

Let's say I want some mana regen. If i pick a Faerie Charm (not considering Doran's because it's a dead end in itself), either I go tear, which ends up in archangel or muramana, the only items that "sting", or I have to go support by going idol, chalice or frostfang.

Lets now talk SpellVamp - life stealing using magic damage. We can talk because it doesn't exist anymore... The runes still have it but if I want to use it, either I get runes for it, or I am forced into getting Vampirism or get Gunblade item, the only item that doesn't specify the type of damage one can use for life leach - that is it. Spirit Visage had a spell vamp component, now it just increases healing that is already coming at you, so if I don't have any other item or player to give me health, that passive doesn't do squat.

Chances of 1v1 against Olaf, Yi, Aatrox, Tryndamere and many others, with the amount of lifesteal items on bruisers, marksman and assassins is pretty much a lost cause.

I am sorry if this offends anyone. That is not the intention. This is my personal opinion on what I consider to be issues in the game that could and should be addressed.

Thank you