I have a late 2013 MacBook Pro Retina running two Dell 21 inch external monitors - they're not bad, not the best - about £200 each so not retina but not garbage. When I installed Mojave I was no longer able to work - the text was making my eyes screwy to the point that it seemed like the banks of text were moving. I found a lot of 'niche' apps - as well as Adobe etc, and Apple's too, including Xcode - were so hard to decipher, that I ended up with a headache as well as a strange feeling of the screen 'moving' in front of me.
So I decided to revert back. No biggie I thought. But then the previous versions of OSX were no longer available on my itunes account, as they always used to be. My only solution was to go to a local independent repair shop and get a version of High Sierra put on a thumbdrive and go from there.
I didn't even go nuts about it - because I've now come to expect this kind of thing from Apple.
What does disturb me, as it always has, is the apologists on here arguing that 'it's not so bad'. I was literally not even able to see straight when I was looking at my monitors anymore!@
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If you rely on using an external monitor, please make sure you have a backup on a thumb drive because you may find yourself unable to work as I did.
So I found a solution. And up until this post to vent a bit of steam, just got on with it - because now, quite frankly, I expect to be 'screwed' by Apple at every turn - whereas for years and years I used to be 'delighted'.
And before anyone says that the various terminal commands, workarounds etc restore things as they were - in my experience, on my external monitors - they most certainly did not. My monitors, whatever settings I applied with these workarounds, looked like they had been taken in a time machine back twenty years.
And before the apologists say that this is the price of progress - I agree in a sense - that things may need to be adjusted in an OS to optimise etc - however there was a. no warning from Apple that this may happen, b. they made it incredibly difficult to go back to the previous OS in a way that had never happened before (all previous installations were gone from my account - regardless of the settings - workarounds such as 'hidden' etc, and c, frankly - if they're going to pull a move like this - at least they should provide their own external monitor I can buy instead of third party rubbish like the LG) etc etc - as a longtime enthusiast I can't see any benefits for the user from this change.