Since you may throw more leading arm jabs than you may throw back arm cross/hook, your leading arm may be tired sooner that your back arm. You may switch sides just to rest your leading arm and use your other arm to deliever your jabs.It depends on the boxer some switch a lot. Some never do it.
It should be used to to create angles or opportunities. So switching during a turn off or a switching left cross. Which i use a bit.
I have no idea how it would help if you are tired other than preserving your leg if it gets kicked in.
You may switch sides if you are a "striker". Unless you can deliver powerful "cross/hook" from both of your arms, otherwise, I see no good reason to switch sides.
You should never switch side if you are a "grappler".
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