I guess you could call this "The Three Fund Portfolio" Harry Browne-style.
I see nothing but advantages here: you eliminate the tail risk of the 30 year Treasuries, have oodles of liquidity due to the cash-like nature of the short-term Treasuries and plenty of gold for SHTF insurance. Replacing the VTI with VT would make it into even more of a bunker. I mean if the PP is for money you can't afford to lose.....
I do like long bonds less than I did when I was younger. Even so, “simplifying” by removing them seems like simplifying one’s hand by lopping the thumb off.
Whistling tunes / We hide in the dunes by the seaside
Whistling tunes / We're kissing baboons in the jungle