Looking for all the good reasons to use the Raw ember. If you're going to say it has no use, don't post; it's not true and it'll just waste space here.
Assumptions:
No BB glitch.
Could be anyone, from a new player to a veteran.
I know a few things I've used Raw weapons for in the past, here's a short list:
Low level runs: getting a Raw spiked club/battle axe is very effective until you can grab a lightning weapon. Makes for more grinding of large shards, but if you're struggling the extra damage can be definitely worth it. Same with a Raw handaxe.
Entry level bow:
A Raw Longbow gets a C scaling in STR instead of E (just looked it up on the wiki and I believe the wiki is wrong; need to verify this). This can greatly help a new player in PvE that is using a str build. Being able to target and not rely on lock on can help pull enemies, or take out enemies out of range of a crossbow. It's also lighter.
New Players:
New players don't know where everything is. If they're going for a Faith build, they may have no idea where a Divine ember is, or the Astora Straight Sword, or any other faith based weapon. With low scaling stats, Raw is easily accessible and can assist them in their journey.
What other reasons could you use a Raw weapon for?