Just my 2 cents, a lot of lightweight laptops actually do have decent specs, prices and some of them even have 2 slots for rams!!!
But why most of lightweight laptops make the arrow buttons in half of the smaller size? And instead, the shift button is longer than usual.

I thought the arrow button should be in normal size Coz we use it more often?

There are 2 shift buttons on it, which I found a longer shift button serve no purpose??

Some ppl do use the right shift, and how often you use the arrow keys?

in the end manufacturers cannot cater all people, some do have full size right shift+big arrow keys but in gaming laptops

We do use it a lot of time during typing dont we?
My personal experience is I tend to missed the button during high speed typing

it's down to personal preference in the end, just bear with it i guess (it's very hard to find full size arrow keys in non gaming laptop now)

The reason behind 2 shift keys is that it is needed shortcuts. Say for eg if I want to add an "@". I have to use Left Shift+Number2. The Right Shift is used with arrows and home button to highlight texts.

Ya agreed with statement it's personal experience. I tend to bring experience from pc to laptop. Just wondering who started the design of half size arrow