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As a mobile engineer with 20 years of experience and some knowledge about web development, I would say that web dev is more mature, flexible and (what is the essential part) keep up with new trends much faster.

Things like declarative UI syntax is still something new in the mobile world (SwiftUI, Compose, etc.), dependency management is a dark area (Android is a bit better, but a total mess on iOS/macOS development side), debugging experience for the web is miles ahead.

I usually ask myself the same question but in reverse – why mobile/desktop app development has not evolved to be like web dev?