Your employer offers you a compensation package for the work you do. This has a given value, and it’s not all cash of course. You assess the value to decide if it’s worth it. It’s value to you is NET of tax, and you know this up front. You never get the tax money, and there aren’t any circumstances in which you get to keep it, so it’s never really yours.
If someone offers you a £48kpa job, do you think ‘oh great, £4k per month!’ then grumble and complain when some gets taken away? If you do, you’re an idiot. The sensible thought is ‘Oh great, £2,915.14 per month!’
Do income tax changes affect your gross or net wages?
If taxes goes up, does the difference come out of your employers pocket or your take home pay?
Thats the flaw in your argument…
(edit, I see Jambalaya’s thought processes were going along similar lines before I refreshed)