I have found a number of instances where I have wanted to generate a variant with varying degrees of branching, e.g. \cs_generate_variant:Nn \tl_case:Nn { No } \cs_generate_variant:Nn \tl_case:NnT { No } \cs_generate_variant:Nn \tl_case:NnF { No } I find myself envious of the functionality available with \prg_new_conditional:Npnn and its ilk where multiple degrees of branching can be coded in a single statement using a subset of { p, F, T, TF }. It would be nice to be able to write something similar, e.g. \cs_generate_variant:Nnn \tl_case:Nn { No } { , F, T } where the empty slot before the first comma denotes the nonbranching variant. I don't imagine I'm the first to have thought this, so presumably there is good (or at least some) reason for not providing the functionality. It would be good to know. Andrew