It’s especially bad with the recent inflation here causing fiscal drag. People are being dragged into higher tax brackets by their incomes rising in line with inflation (if they are lucky) but the tax bands are remaining at their pre-inflation levels so in real terms we are taxed more while earning less.

I think “the cliff” ended up being introduced in better times when £100k was an extremely good salary. It still is a good salary but it seems like when they introduced the policy they were likely thinking that folks earning it were making so much that it wouldn’t be worth their while to put the effort into avoiding it. However with recent cost of living challenges the demand for avenues to avoid the cliff rose and employers started to respond by offering schemes like the salary sacrifice pension one I mentioned in order to keep their employees happy.

Edit: There are many ways to avoid taxes such as creating your own limited company, paying for your lifestyle as a business expense and then only paying corporation tax on those expenses (currently 20% in the UK). At the same time you draw a “salary” from your own company which is substantially lower than what you would be getting if you include the expenses and then pay income tax for a lower band. The reason most people don’t do this - aside from the obvious moral implications - is that it’s usually more effort than it’s worth for them. At a certain point though, tax avoidance becomes so worthwhile that the temptation is too great for many to ignore.