To be honest, the front positional idea sounds like it comes from someone with only armchair knowledge of tanking and melee. For positionals to matter, you need to have more than one type of positional. An active tank isn't going to swap from front to flank, because the boss is going to spin with them. The 'positional' element in tanking traditionally was that if you point the boss the wrong way, then they cleave the group. I think the only thing that you'd add with such a design is having the non-active tank play chicken with cleaves (if they exist) to get in their positionals.
It's not so much a detrimental idea so much as it wasn't well thought out. I wouldn't double down on it.