This would affect the block hashes wouldn’t it? This means it adds another way to break de-duplication in addition to choosing different chunkers as summarized in my deduplication summary. This means the same file added with different chunk or leaf settings will not deduplicate at all.
I understand that IPFS is new and still developing and experimenting with these settings, but it might be nice to expend some effort on making the defaults the best-practice recommendations for good de-duping, and if you play with the advanced settings make it clear that you are breaking deduping.
BTW, IMHO raw leaves are better and should be the default 