Do we even have reason to think Venat still resides in Hydaelyn? Moreover why should we think she isn't tempered, when Elidibus was?The revelation that she's a Primal was a hard blow, to be sure, though it seems quite likely that she's more along the lines of Shiva - a Primal with a real person inside, guiding her actions. This puts her on a different level than other Primals - not a better level, or worse, but it leaves hope that she may genuinely be the benevolent being she was presented as, and not merely a slave to the "programming" she was originally created with.