5E was very successful for what it was intended to do: make D&D approachable and simple for the casual mainstream audience at the expense of absolutely everything else.

Which yes, unfortunately makes it very unsuitable for use in video games.

Alright. For one example 5e has basically no real character creation yet it’s still way to complicated to make a character, and that extends out to every part of the experience. The economy? Doesn’t exist. Exploration? No tools for it on either the DM or player side. Combat? Very few options unless you homebrew (which is generally a bad thing to rely on) yet still complicated enough to take ages for a new player. Roleplay? The least complicated problem in that it has no systems to support it what so ever, but that removes any selling point as well. They’re are some issues outside of the game (like the monetization) and likely a lot of smaller issues i don’t remember as well, since it’s been a long time.

And yes 4e is better than 5e. I dislike both, but 4e actually tried to make a good system.

Edit: it mostly boils down to being complicated without actually having choices or even giving you tools to run the game. Pathfinder is a complex, maybe even bloated, game, but that complexity exists to give you the opportunity to do more. In 5e it exists to be more verbose with something that could have been edited down to a single booklet.