Seems a little exaggerated, also jumping on a train of a bunch of internet dwellers who misunderstood something ... because gimp is still in Mint's repos, it just isn't installed by default anymore.
And "update-grub" has been with us for a long, long time. On Debian, Ubuntu, and all distros based on that.

Never been there on Slackware

yeah well not on my distro either, but that doesn't make it stupid or bad or whatever OP seems to be suggesting in their last post.

Colorpurple

Thank you for the suggestion. Unfortunately the link is from 2015. The program does not appear to be available on the repos. I doubt it would work anyway because Mint appears to bypass the the standard grub configuration file and use their own.

Ondoho

The issue was not with grub-update. The issue was that the config file that grub.update uses appears to be a mint version in a different location than the standard grub configuration file and changes to the standard grub configuration file in /etc have no affect.

Also I did not mean imply anything was stupid. I did not mean to imply anything. I always try to make questions on forums my last resort. So I am very dissappointed that tutorials from legitimate respected Linux help sites that have always been spot on in the past do not work on Mint 19.3 because of the Mint non-standard Grub configuration. And when I search I always limit the search to posts that are within the last year to ensure that the results are timely. I don't just rely on one but checked several websites and the steps of the Grub configuration tutorials were identical in each tutorial.

If my choice of words offended you in any way I apologize.

Here is the grub-customizer web site: https://launchpad.net/grub-customizer You say you like gui, Grub-customizer makes changes to the grub configuration files and will let you view them before saving the changes. Maybe grub customizer will help you sort out why you have to /boot/grub/grub.cfg, which you shouldn't have to.

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Thank you Colorpurple. It was very generous of you to look that up for me. Unfortunately I do not install software unless I write it myself or it is on the official Ubuntu or Mint ppas. As much as I would love to have a GUI for configuration I can't take the chance with non-officially endorsed software. The work I do is sometimes sensitive and can involve other company's proprietary information or technical information the Chinese would love to have, so I have very tight security rules. One of them as recommended on many security sites and by Ubuntu as well is to never install software that is not from the official ppas (I think they are called "repos?"). This is why I use Linux, aside from the fact that I hate Microsoft for killing off innovation for a very long time and Wordperfect, the best word processor ever written. I do like Libre office as a replacement, I just wish they would add "reveal codes." Then I would be in heaven.

Anything I would work with on a Windows 10 machine would be completely accessible to Microsoft which is why I still use Windows 7 and that machine has no network card. Microsoft has a well-documented history of stealing code. In fact the very first software attributed to Bill Gates was actually written by his roommate in college. Dos was stolen from its author. Windows 7 is almost certainly partially LINUX code based on its behaviour.

But thank you anyway!!

Well... I do not think that is much valuable.

Why change a command, no, why hide a quite self explanatory command behind another one?

Upstream respects the usages and it is straight forward : make grub config in there. No need to fix or tweak nor explain anything imho.