I don’t know that people are saying “invest it in the stock market”. I’m saying if you have to withdraw your investments for 8 years to wait, then you are depleting your nest egg for the hopeful promise of a bigger payday later.
Let’s pretend you spend $50k per year and you are retired so, no other income. For those 8 years of waiting you will reduce your investment account by $400,000, while getting no paycheck from the government.
Your SS monthly checks would have been around $2,000 each, or $48,000 combined and you would have your investment account intact. If you were earning 10% per year (I know, I know, not guaranteed) you would have 8 years worth of investment income (or stock gains) to look at.
Meanwhile, at age 70 (8 years later) you are going to get $4,000 monthly each, or ~$100,000 per year. You will certainly make up the difference, eventually, and “get ahead”, the question is “will the excess be of use to you by the time you do?”
You are now making an additional $50k per year from SS, but you are making around $40k less from your investment stash, all figures plus or minus.
Again, I can’t be bothered to spreadsheet this. The numbers above, for instance, are a fiction, because there’s no “inflation” calculation built in - but that would be true for the investment pot or the SS check, so I’ve ignored it.
All of this is to say I’m not arguing the point strenuously, just saying that it’s not as dire as some intimate, and I enjoy pointing out that those who are most vociferous on the point always - and I mean always - ignore the fact that you’re spending down other assets and that once you finally do get ahead it may be late in your life. For some that’s kind of a drag because the extra money isn’t a big deal when you’re (here it comes) drooling in the corner of the solarium.