My perspective from going through a similar mental calculus: Income annuities are not investments or at least poor investments. They are insurance products. They insure against running out of income should you live "too long". A SPIA is very much just an inverse term life insurance policy.
Like all insurance, you only need to cover risks you can't or don't want to bear yourself. In my case, I want my annual budget past age 70 covered by guaranteed income sources. But I don't want to spend anymore on the insurance of an annuity beyond that - because annuities are insurance, but poor investments. In my case, my age 70 SS and annuitizing my employer cash balance plan combined will cover my income needs. Those are insuring longevity risks I'd rather not take. Especially in my case since my family history is to live a long time, but loose quite a bit of cognition over the time span.
From what you've said, it looks like you have your necessary income guaranteed by SS and pension, although you didn't include your proposed ongoing retirement budget. Just from that assumption, I would say you are not a candidate for purchasing any more annuity, even a simple common sense one like a SPIA. Simple investment portfolios like a 60/40 indexed portfolio or a indexed target date fund and likely to be much better investments for your portfolio.
A consequence of self insuring longevity risk is you can be too conservative in your spending and leave a lot to heirs when you could have spent more of it and enjoyed life a little more. Thus a SPIA can levelize your income over your retirement years and give you the ability to enjoy more of your money, or even come closer to dieing broke if that’s your goal.
Just another angle on how SPIAs insure against longevity risk.