Not that different, it’s a slightly higher rate of tax free limit and a slightly higher rate of tax for those above that limit. Generally a rate when specified is just plucked out of thin air on this forum, not literally the specific rate that person thinks is the best example.
The reality of the situation would be the only people paying more in tax would be those top 10-20% of earners. Yes, I’m sure some of those will complain, but it’ll be fairly easy to point out their complaints are unfounded as the tax is “only” on income for luxury items AND it’s a flat rate of tax over a living wage, not some arbitrary rate at an arbitrary amount like it is now.
With the current tax situation we have a ridiculous situation where people on minimum wage are being taxed on their earnings, while they cannot even afford to put a roof over their heads in some cases. We shouldn’t be taxing people on money that is needed to literally survive, but I don’t think it’s unreasonable to tax people on money that they don’t need, but make their lives more comfortable.
I agree apart from the the part about the complaints. The people who are complaining about income tax being a punishment for being paid a lot are hardly likely to stop doing so if they're being taxed more. I don't see any reason why changing the number of income tax bands to 2 from the current 4 would change anything about that. I think your proposal would increase the complaining rather than decreasing it because it would mean that the working poor weren't paying income tax at all. Pointing out that you think their complaints are unfounded won't matter to them.
I also see the reasoning with the opposite approach, i.e. increasing the number of tax bands to 8 or more rather than decreasing the number of tax bands to 2. I think that the increased complexity of that approach would probably increase costs and increase tax evasion, but maybe not by a significant amount.