Honestly the reality is mobile games just developed a horrendous development culture and incentive base.
What I find kind of baffling is why did mobile gaming manage to effectively kill pocket sized gaming systems. IE I'm seeing the positive sign of the semi-portable systems. IE Switch and steamdeck...
But the gameboys and PSPs were basically killed by mobile phones. But they offered, basically quality games... yes 4+ generations behind existing PCs and consoles. But fun complete games that were worth $20-$50 to drop, and actually get many hours of fun out of.