I find it fair, in fact i quite like it - it’s putting less pressure to keep up to date for solely financial reasons. I would update software in the past in fear of being left behind and having such a financial jump, so this is great to not feel that burden if the pricing remains.
If the new features are worth the price you pay, that’s all what matters. If we start questioning whats ‘fair’ then where does it stop? i.e. i get very little value out of this new update, whereas the next person it may be worth 5x more to them with the new exporting functions.
You could also complain it’s unfair in summer when there’s 40% off too, with this reasoning. Why should people who wait pay less? - same argument.
Someone who hasn’t updated since v4 wouldn’t have had all the years using the newer stuff, so they don’t ‘gain’ any unfair advantage. I can understand if your price has increased and you’re complaining then i would find it unfair, but that’s not the case.
Also, a critical aspect to this financially means that your current license will not devalue as quick. I think that’s great for everyone who supports perpetual licensing, as there’s a real value to keeping hold of your license.