I do think it has an impact on incentives and work in the sense that if you're on 100k and you're weighing up whether to go for a promotion to the next level on maybe 120-130k and there's a 65% marginal tax rate, you're thinking is it really worth the extra stress, responsibility, pressure, work hours to be taking home 35% of the extra, or maybe 10k a year after tax best case?
People might feel pretty much as well off on around 100k with a better quality of life. Companies then find it very hard to get people for higher roles and maybe locate those high end roles elsewhere so the tax take doesn't increase as hoped to the exchequer. It's not a cliff edge but can definitely influence culture over time imo