In the rapidly evolving landscape of Angular 21, this guide provides a practical overview of the current state of form handling in Angular.

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Angular 21 introduces experimental Signal Forms as part of its shift from zone.js-based change detection to a signal-based reactivity model. While core signal primitives are stable, Signal Forms remain experimental and lack the maturity of Reactive Forms. The article argues that teams should continue using Reactive Forms for production applications until Signal Forms APIs stabilize, as the current implementation requires manual validation and state management. Angular's backward compatibility allows developers to upgrade versions while waiting for signal-based forms to reach feature parity with the battle-tested Reactive Forms system.

Angular 21 — Signal with Forms — Why Sometimes Waiting Is The Better Choice

Angular’s Shift in Change Detection: What It Means for Developers

The advanced solution is on the way, experimental API was released.

TLDR: What a bad article, it simply says Reactive forms is mature, and signal forms are experimental.
It tried to show how “bad” and “complex” forms were with signals (in Angular &lt;21) in relation to not using signals inside reactive forms. But honestly I dont think this was ever a valid point to manully put signals into a Reactive Form…
And all it says about Angular 21 and signal forms is just that is new and experimental…? Useless blog post.