No I do not think it’s fine. I did read what you said, but from your reply it’s obvious you didn’t read what I said.
I said if “apply evenly to all sources, investment sales taxed at same rate as wages” From your reply “billionaire takes money from capital gains (lower taxes)”. That’s not the same rate is it.
I said "No deductions."From your reply “so its use can be written off partially” That’s a deduction isn’t it.
The current system where rich pay a lower tax rate because they can take advantage of things like capital gains and deductions is not fair or equitable. A flat rate system that eliminated things like capital gains and deductions would not be fair, but it would be fairer because it keep the millionaire mfrom paying a lower rate than the poor (or the software engineer).
Graduated tax that eliminated things like capital gains and deductions would be fairer still. Also gift exemption, inheritance exemption and other carveouts that unduly favor the wealthy should at least be be adjusted if not outright eliminated.