I use VBIAX rather than the two separate funds in my Roth IRA. My goal is to never access the Roth and to leave it as a legacy. So it’s simpler to just to have the one fund. The older I get the better simplicity is looking.
If you are never going to touch it, 100% stocks is better in Roth. Shoot for the moon.
Our Roth accounts have 70% Total US and 30% Mid-Cap Index.
Put bonds in Traditional/Pre-tax places.