If you wanted to go in the other direction, you could achieve more productivity with faster mouse skills. The competitive FPS genre has spawned a bunch of aim training tools[0] to improve muscle memory.
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As someone who went down the keyboard only blackhole, I've rebounded all the way to mouse maximization. Mice are nice! Another tip that really helped me is embracing good mouse acceleration (i.e. not the Windows or Mac built in garbage). This tool has honestly made using a mouse at least 3x better for me: https://github.com/RawAccelOfficial/rawaccel
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If you wanted to go in the other direction, you could achieve more productivity with faster mouse skills.
I was always in the camp that believed that the keyboard was always faster than mouse for complex workflows.
Then a couple of weeks ago I spent most of a day in a hospital emergency room with someone, and couldn't believe the way those E.R. nurses fly through the menus and options in Epic using just a mouse.
I'm now closer to believing that "muscle memory is muscle memory." But I suspect it only works if the windows appear in the exact same place all the time.
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I think muscle memory is a huge part of it. I've seen both the slow hunt and peck sort of folks working on keyboard only apps in auto parts stores and I've seen the guys who can fly through all the screens like a wizard.