I recently installed LMR's TB reinforcements on my car. I had
BBK upper and
lower control arms with poly bushings and planned to swap to the exact same set up you plan to. I also had the same thought process as you and decided while the
control arms were out I'd add the TB kit for peace of mind. Are they necessary? Probably not. Especially considering I had the "wrong" set up before and my TB's were perfect. In my situation (no racing or slicks), I kinda figured that it was a preventative measure - reinforce now to prevent possible damage later.
I will say though; it's quite a bit of work if you plan to weld in and want to completely remove the interior. It was a fun winter project though.