> that require legal to get involved and you do end up with documents that sound excessively broad

If you let your legal team use such broad CYA language, it is usually because you are not sure what's going on and want CYA, or you actually want to keep the door open for broader use with those broader permissive legal terms. On the other hand, if you are sure that you will preserve user's privacy as you are stating in marketing materials, then you should put it in legal writing explicitly.