author here. as i mentioned in post i said we choose frankenphp since it's already supported by php foundation and in some cases we might use Go php extensions. i know writing extensions in any language add a bit complexitiy but i believe if the extensions selected wisely they will be somehow fire and forget. for instance creating pdf files would be faster in Go than php. you can create an pdf creator extension and that extension would probebly work for a long time without any adding much effort to maintenance.