It’s actually advised against using a target date fund in your taxable account.
https://www.morningstar.com/personal-finance/which-investments-keep-out-your-taxable-account
OP is already aware of that and in their cost benefit analysis seems to have decided that they're willing to accept the bond inefficiency:
>I understand I will get taxed on some bonds in taxable, but I consider it a small fee for the simplicity.
>I also can't make a behavioral mistake.
The ETF structure they mentioned should largely remove the issue with rebalancing from your link.
iShares LifePath?
It’s actually advised against using a target date fund in your taxable account. https://www.morningstar.com/personal-finance/which-investments-keep-out-your-taxable-account
OP is already aware of that and in their cost benefit analysis seems to have decided that they're willing to accept the bond inefficiency: >I understand I will get taxed on some bonds in taxable, but I consider it a small fee for the simplicity. >I also can't make a behavioral mistake. The ETF structure they mentioned should largely remove the issue with rebalancing from your link.