The new 5x version has great improvements:

• Improved caching of web resources and automatic activation of Schema.org data to improve indexing in search engines.
• Optimized the code to improve speed, we have made Joomla compatible with PHP 8+.
• Updated to Bootstrap 5.3.2.
• The TinyMCE editor has been updated to version 6.7 with new image alignment features.
• Improved media management with AVIF support and the ability to exclude archived content from Smart Search indexing.
• Sort the menu as you like.
• Strengthened security by migrating events into relevant classes.
• Removals of outdated Recaptcha plugins.
• Internal code, using more updated API and adding support for JS import map in Web Asset Manager, along with fixes for PHP 8.2
• Introduces Fontawesome 6.4, Codemirror 6
• Update its Webauthn library.
• We now require PHP 8.1, MySQL 8.0.13+, MariaDB 10.4+, and PostgreSQL 12+ for optimal performance.

Joomla 5X meets all  modern needs of a CMS, ensuring speed, security and an intuitive user experience.