The main advantage is simple: you free up a lot of storage.

The main disadvantage is also simple: once the RAWs are gone, you lose the ability to reprocess those images later. RAW files are your digital negatives; JPEGs are finished outputs with less editing latitude. If you ever want a different white balance, better highlight/shadow recovery, improved noise reduction, or to take advantage of better future software, the RAW is what preserves that option.

If you’re truly satisfied with the JPEGs, deleting RAWs may be acceptable for some images. But doing it in one big automated sweep is risky: you may delete files you didn’t mean to, or remove RAWs from photos you’d later value more.

A better approach is to cull selectively and improve your workflow going forward: rate, flag, keyword, and delete low-value RAWs early instead of archiving everything indefinitely. If possible, move old RAWs to inexpensive backup storage rather than permanently deleting them.

So: pro = space saved. Con = no way to change your mind later. If you proceed, do it deliberately, verify what you’re deleting, and avoid irreversible command-line bulk deletes unless you have a backup.