WP Support Plans for Non-FSE Themes

Hi,

I have a question related to the theme development processes currently supported by/available with WordPress.

I’m just about to start a theme development process for a client, and my original plan was to use purely the new FSE theme dev processes (theme.json, html parts and templates, block styles/variations/patterns etc.) – however, after a thorough review of the wireframes I realized that this environment is just too rigid at the moment, and I’ll need to combine things with good old PHP templates.

Now, my concern is that I deliver the site to my client, and, for instance, in 3 years from now, WordPress stops supporting PHP templating in themes.

So, my questions are:
1. Is there an official support and deprecation plan at Automattic regarding the pre-Gutenberg era’s theme development processes and methods – aka, will the theme I’m about to start developing be in a risk of becoming deprecated?
2. If there is such plan, how long will non-FSE PHP themes remain supported and functional?

Thanks 🙇‍♂️</img>

 

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