It's true that the modern stock market is a spectrum ranging from highly speculative "growth stocks" to blue chips / income stocks. Bonds are even further down the safe-claim-to-future-money spectrum.

While your argument is technically correct, there's a world of difference between cryptocurrency where the inherent value is definitionally $0, and stocks/bonds/commodities/real estate where the inherent value is almost always above $0 and can, if you want, be a large percentage of its total price. That allows an investor to determine their own level of speculative risk.