What are some good ideas for using "relativenumber" in Vim?

Question

It is indeed useful, but leaving it on all the time still seems to have some side effects
Mapping a shortcut key feels a bit "unnecessary"
Is there some kind of automated idea?

Answer 1

It would be more useful to know exactly how many lines to move up/down, and it feels suitable for movement in a small range.

Line numbers are generally not used a lot. To move a large block, you can scroll or text-objectmove. You can almost locate it with a few clicks.

How to use it depends on personal preference.

Answer 2

Imagine when you want to copy and delete multiple lines of code. If you use absolute line spacing, you can delete line by line, but it will be very awkward if you copy line by line. You can either delete/copy by calculating relative line spacing (d10d), but Calculating line spacing takes time. Using relative line spacing, you can intuitively see how many lines I want to delete/copy