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You would use 'dd' instead which is faster since you don't have to have make sure your other hand is in the correct position.

My example involved deleting two lines, which you can accomplish with '2dd', 'dj', 'dddd', etc. When my hands are on my keyboard 'dj' is my personal preference. The parent poster was using arrow keys so naturally I'm wondering if for something like 'dj' he/she would use 'd + down arrow' since that seems like waste of time. It's a somewhat contrived example to see how far some users take the use of the arrow keys, which you quickly realize are not necessary in vim.

I have a ThinkPad. The keys are closer together.

Used for most editing tasks. Those seconds are fractional compared to thinking time before cutting code. I'm not paid in words per minute.

w, g, / are used more than the arrows anyway.

It depends on your keyboard as well. I use a Kinesis Advantage, which has the arrow keys in a place that doesn't require movement from your hands, so hjkl doesn't provide the advantage that it used to.