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Social Security discussion ignores the factor that for those who do save for retirement, expected social security benefit is currently part of the calculation.
Other dirty little secret finance bros don't like to talk about is that retirement saving has way more to do with luck than sound financial planning even with GOAT indexing. The rate of return you get over your lifetime plays such a huge factor in how much you end up with. Lets say a 30 year old currently has $100k in their 401k. If they never invest another dollar, but the market returns 8% annually, they'll have approximately $1.5M at age 65. If instead, the market only returns 4% annually over this time period, that same 30 year old would need to contribute $15k annually to end up with the same $1.5M at age 65.
While your point is fair, FWIW the worst 35-year return in the history of the Dow is ~6% annualized. Over that long of a time horizon, things even out pretty well, and savers are welcome to assume conservative returns if they'd like.
ETA: assuming reinvested dividends, obviously