First, I'd like to follow up on Fozi's suggestion. I don't even think it needs to be a menu option. Just add something like "TabAccessibility = True" to the options.txt but don't have it appear in any of the ingame menus. So players who want to disable the Tab accessibility functionality have to make the conscious decision to disable it. Thus it will be impossible to accidentally turn it off, making it pass the guidelines Maria mentioned in the moderator notice.
And the second thing, for those annoyed with this issue, it appears a beautiful someone has made a mod to fix it (for 1.14.X). Interestingly this mod was posted yesterday. As far as I can tell it works. Here is a link: https://www.curseforge.com/minecraft/mc-mods/tab-inventory
Edit: Spelling and grammar
First, I'd like to follow up on Fozi's suggestion. I don't even think it needs to be a menu option. Just add something like "TabAccessibility = True" to the options.txt but don't have it appear in any of the ingame menus. So players who want to disable the Tab accessibility functionality have to make the conscious decision to disable it. Thus it will be impossible to accidentally turn it off, making it pass the guidelines Maria mentioned in the moderator notice.
And the second thing, for those annoyed with this issue, it appears a beautiful someone has made a mod to fix it (for 1.14.X). Interestingly this mod was posted yesterday. As far as I can tell it works. Here is a link: https://www.curseforge.com/minecraft/mc-mods/tab-inventory