Items/builds are too restrictive

There are many items in the game which fit many situations. Especially those for countermeasures. However, being able to actually use said items is reliant on 3 things. You have the gold to purchase them, there is a need for it, and you are not behind. The biggest challenge is the third requirement.

item build paths are very demanding with almost 0 room for variation before you acquire the core items of your build. This is an issue because it restricts your options for items which situationally could help out a lot, like on an ADC vs a heavy ap poke lane. Now sure, no one is forcing you to not build first item, but if you want to have any chance to win, you cant build it. Your first 2-3 items are so important to get asap, that deviating to just grab a component is potentially game throwing. It throws off your power which is needed to survive. Because in the end, so what if you got a to deal with the poke, the enemy adc finished and now you cant even contest at all in trades because you lack the power of a full item.

Im not sure what would need to change to make this better, but it would be nice to be able to pick items for certain situations without throwing the entire game away. I know that it is not guaranteed that you will lose, but it is much harder to win when you do this. So much that you almost always have to force your core build over these items which could save your life simply because you will be forever behind if you dont.