Yandex Metrica, Google Analytics VS React.js site, ok or problems?

Question

Search Engine Optimization

Developers are building a new version of the site on React.js.
It is planned to give the html document collected by the script on the server side at the first call. Further activity is rendered on the user's side.
Question: What are the problems of accounting for behavioral statistics in terms of SEO, and how to avoid them?

Answer 1

Search engines may stop seeing/indexing content.
1. write a site without ajax/js so that it displays content that needs to be indexed by search engines,
2. then add dynamics/ajax...
Using laravel, symfony as an example, it looks something like this: first write request processing on the web route, then write processing on the route api.
Background loading (ajax) on the entire site is no longer a site in the classic view, but a web application (client).