Well. Consider these three kanji for a moment.
Let's say that you decide to learn the kanji in the JLPT order.
This means that you will learn 貸
quite early at the N4 level.
However you won't come across the extremely similar貨 until much later at the N2 level.
Now you have a problem!
You will confuse these two kanji with each other.
This means that you now know less kanji that you did before you came across 貨
With this method you are constantly taking backward steps.
So Frustrating! And a pointless waste of time.
Now the problem is clear.
The Kanji are far too similar in appearance. You will constantly mistake them for each other!