Granted, gaming is more complicated and requires more specific devices for many titles but why can't more physical games be a combo pack like movies?

One extra reason could be if your disc gets scratched or lost you still have the game with a digital code. Perhaps it's a value proposition because some people give a physical disc or code to a friend or family in a combo pack meaning you paid one price for two people to have a copy of the movie. Is that what might be stopping games from adopting such a thing? I do have a feeling these combo packs would be more expensive, whether they're the only physical release or not for a game. 

Why? Because we tolerate just about anything our masters tell us to tolerate. That's why.

I don't think a lot of them still do.

Besides, the digital copy was included in Blu-rays/DVDs only when the movie was first released. The code usually expired within a year or two, and reissues didn't have it.

Because console gaming is a monopoly of 3 companies (well, of 2 since Microsoft has been a non factor lately), and the two players are complementary instead of direct competitors

Since neither have to be specifically concerned with aggressive competition they have opportunities to make choices that will always lead to maximum profits, even if it costs consumers more money

Classic example is paying for online...

Don't quote me on this, but I thought during the time physical movies were offering digital copies was also during the time when piracy was at a high and this was one of their strategy to try and lure people away from that.

I think the real reason why physical video games don't offer free digital copy is because....too many of you are willing to actually pay full price on games, which is making publishers lots of money on games you don't even have full ownership of lol

May be a small handful, but really, nobody out here are buying digital movies because everybody is streaming these days. If anybody is buying movies it'll be the physical copies. Movie studios are not making bank on digital movies sales so throw that into the physical copies as incentive; especially when so many devices don't even include disc drives anymore.

Yes. And even though I've paid my fair share for it over the years, I don't think I'll ever pay another dime for it again. Over the course of the pandemic, I ended up pulling out a lot of my retro games and systems, and with the help of family and friends, managed to rediscover the joys of couch-co-op. There is so much more substance to playing on the same TV with people you care about than anonymous people online. I do not miss the racial slurs, getting booted from games, simply for having the audacity to join an open room. I don't miss the toxic, no-name guy on the other end, sending me vulgar messages because I was better than him, or his dad didn't give him enough hugs as a child. I don't miss any part of it. Nada. Nothing. I'm happy playing another round of MK64 with the people I actually care about. It's just better that way.

Because they would make less money that way.

Many companies seem generous when they're trying to establish a new revenue stream but that generally ends once they succeed.