But lit needs lit's custom DSL, lit's custom reactive components, custom everything.

Even in their most trivial example literally everything is custom, and specific to lit:

    import {LitElement, css, html} from 'lit';
    import {customElement, property} from 'lit/decorators.js';
    
    // custom lit-specific decorator
    @customElement('simple-greeting')
    export class SimpleGreeting extends LitElement {
      // custom lit-specific css function
      static styles = css`
        :host {
          color: blue;
        }
      `;
    
      // Custom, lit-specific reactive properties
      @property()
      name?: string = 'World';
    
      // custom lit-specific render function 
      render() {
        // custom lit-specific DSL
        return html`<p>Hello, ${this.name}!</p>`;
      }
    }

BTW. Claiming that Virtual DOM is somehow a react-specific technology (and that somehow apparently affects conversion from React to something else) really shows how much you understand about the topic at hand.

Edit: hint: that is why Lit's library is also much smaller

I: ask to show me how converting from lit to something else is easier as you claim

You: ignore everything completely and answer a question literally no on asked, and pretend that the only custom thing is the DSL.

Yup. My choice to completely ignore you in a sibling discussion was correct.

On the other hand, after a few years of engaging with web component defenders, propoenents and propagandists I'm not surprised in the least. This behaviour is on par with the rest of them.