The difference between just right and over the line is a very small volume of oil, however if you want to drain a bit, doing it via the sump plug can be messy and hard to control
If you remove the filler cap and lean the bike over to that side, some will drain out, have a pan placed to collect it and all good
Of course, you need a good grip on the bars and a bit of muscle to hoik it back up vertical again, but it works and is easier to control!
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