Windows users use apps that were written ages ago without any updates and they're fine, I know because I was one of them, it's iOS 7 that spoiled us with UI updatesYou wouldn't want to use an app that was written for OS X 10.4 on El Cap or Sierra and hasn't been updated for newer OS versions.
Also, there're many alternatives to Caffeine in the App Store.
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Pixelmator got some really great updates, it's an amazing app now but if you're into photo editing, give Affinity Photo and Affinity Designer a try.Ive tried Pixelmator in a very early version, seems to be fine. Adobe is the industry standard, so theres no way around it as a professional, especially if you have to work togehter in bigger teams, with clients or other companies.