for tiny fillets, centerlines seem to be just creating more confusion and overcrowding an, already tight, area that includes essential dimensions.
If you're using the setting that automatically inserts centerlines at all possible locations in a drawing view, I'd suggest you stop doing that. To answer the question in the discussion title, no, they shouldn't be.
Manually inserting centerlines in a SW drawing is the only way to go (at least up to SW 2018, as far as I know so far).
The auto insert centerline function inside Solidworks drawings has been broken for as long as I can remember, and as far as I know, there is no push at all to fix it.
So, we are stuck with the manual insert......but that's ok, since that is the way I did it with literally every other CAD package that I have worked with.
I am guessing that you don't actually mean centerlines. You mean centermarks (crosshairs). No, those are not required on fillets either.
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