I personally look at this from a different perspective.
I am currently withdrawing $25,696 from my IRA each year to pay $7,696 in Fed, State, and Local taxes so that I can use the remaining $18,000 to make my $1,500 monthly mortgage payments. My total mortgage payments for 2023 will be $16, 800. My December payment will only be $300 to pay off my mortgage.
Plan A in 2024 could be to do a Roth Conversion where I withdraw $25,696 from my IRA and add $18,000 to my Roth, while paying $7,696 in taxes each year for the remainder of my life!
Plan B in 2024 would be to deposit $1,500 a month into a standard brokerage account and invest the money. Then, in 2025, at an average 12% return on my investments, my LTCGs would be $2,160 and my taxes on those gains would only be $388. My IRA withdraw in 2025 would be reduced by the LTCGs, so I could only withdraw $23,536 and pay $7,049 in taxes. My total tax savings in 2025 would only be $259, $528 in 2026, etc.
My estimated 2034 situation, at an average 12% market growth, would be a standard brokerage account with $212,085 of tax free investments, earning $25,450 in LTCGs, limiting my additional IRA withdraws to only $246 with an annual tax savings of $3,054.
If all my extra money was in a Roth, and I needed an extra $20,000 to buy a new car, I could make the Roth withdraw, but I couldn’t just put the money back whenever I wanted. If the extra money was taken from a standard brokerage account, also tax free, I could replace the money in that account any time I wanted to.
This is just a personal choice, and I do enjoy "playing the market".