The reasons to do so may seem obvious — most people prefer to keep more and pay less in taxes — but there are some advantages to keeping your taxable income relatively low that you might not be thinking about.
In retirement, especially when retiring early, a taxable account can be a great primary source of spending. Only the gains are potentially taxable; your cost basis won’t be taxed when you sell.
Most people will retire based on where they want to be, not what the tax repercussions are, but it’s important to understand that what’s considered to be a low-tax or high-tax state might flip flop in retirement.