For any major release of WordPress / Theme / Plugin, I will always wait for at least minor update is release. Example like WordPress 5.5, I’ll wait for the release of WordPress 5.5.1.
Downgrade WordPress is way more easily that you think, all you need is follow the steps.
As once of the core feature of WordPress 5.5 is the auto sitemaps XML, but if you already have SEO plugins installed, this may cause duplication or conflict with sitemaps that is generated from the SEO plugins. Therefore, is better to disable the sitemaps feature in WordPress 5.5
Client website drops from number 1 to page 6 due to enhancement by another web developer. After some fine-tuned, client back to number 1 in less than a week?