I have a custom game engine, and I make games that use that engine. I have about ten different games, all using the same engine, but they were written over the

I have a custom game engine, and I make games that use that engine. I have about ten different games, all using the same engine, but they were written over the course of many years and so are written against different commits within that engine repo, and git submodules capture that idea perfectly. If I didn’t have something like that where I effectively had a long-lived library which I wanted to pull into multiple projects, I probably wouldn’t bother with the submodules. But it’s *so* much more convenient to have them in submodules than to copy the engine code separately into each project’s separate repos and then manage applying every change to the engine in all the different game repos individually. Really, git submodules are exactly the same thing as subversion ‘externals’, but always pinned to a specific commit (which is an available-but-not-enabled-by-default option under subversion), and with a substantially easier interface so maybe folks who don’t need them are more likely to notice them and grumble about how they don’t solve an issue they have? IMHO git submodules are a huge quality of life improvement over the same system from subversion (as was available in subversion back in the 1.8.x era; I haven’t really used svn in anger in a long time). I definitely wouuldn’t want to go back, or to not have them available.