>The so called studies show people who aren't used to modes are confused when using a modal editor.
"Don't listen to this study, listen to my firmly held belief". That's not how this works. If you want to combat a study you need to do so with another one, not by just saying throwing out untested assumptions.
>From what I have seen, people who leave vim in insert mode are the ones making mode errors. Insert mode isn't the rest mode for vim, normal mode is. You are bound to make errors when starting because out of habit, your mind assumes insert mode as the rest state.
Thanks for the condescension. Have you ever started to type a word and had your hands just finish it for you? Sometimes there will be some relatively large word that I type out commonly enough that when my hands notice the first few letters of it they'll type it out automatically with me having to go back and delete it and type out the similar starting word I meant to write. I even recall having my hands do it again on the correction once.
Having this kind of muscle memory is a killer for vi usage. Lots of times I have intentionally left the editor in insert mode for just a second while I grab some text from, say, a website to paste in. What I didn't realize is that my hands knew to always get back to command mode when changing screens so even though my mind had tried to save keystrokes my hands defeated me. The result? Pasted a huge document into command mode. Great. Similar sync issues came up regularly enough that I typically mashed Esc 2-4 times (in case there was, e.g. a command active that would write in the Esc char) rapidly before starting anything to ensure that I was where I thought I was.
In my experience, I wouldn't get the time savings I should have been getting due to having to slow down for the mode management.