After more than 25 years of using software, IMHO it's a losing battle to try to change the environment around you. It's also a losing battle to try to change yourself. You'll never keep up in the long run. After a while the pace of change becomes so rapid, and change comes from every corner at every level. Eventually what you once knew becomes useless and outdated. You can keep up to some extent, but be prepared for a lifetime of unpleasant surprises.
What works, IMO, is instead to build an environment around yourself that works for you, that protects you from the things changing that you can't control. An internal abstraction layer, a bubble. Then when the bubble breaks in little pinpricks and starts crumbling, you can repair the internal environment to be pretty much what it was before. So by all means, make your own little commands and scripts and stuff. Get cozy, but try to pick your battles wisely on what you will depend.