Refer : aem4beginner.blogspot.com/scheduled-activation-with-workflows 

Overlay the RTE component and add your required style in the same.https://experienceleague.adobe.com/docs/experience-manager-65/administering/operations/rich-text-editor.html?lang=en 

There might be issue while moving a page after upgrade to 6.5 Service pack 12Refer : https://experienceleague.adobe.com/docs/experience-cloud-kcs/kbarticles/KA-18970.html?lang=enfor more details.

Kindly refer https://github.com/thingsboard/thingsboard/issues/1335 

Does your propertyName contain any special character?names must contain only Latin characters, numerical digits and underscore “_” as special character.

Refer medium.com/adobetech/saml-authentication-in-aem-using-microsoft-azure-active-directory-30d668338a8f  

Kindly check the below link.link    

If they are not functional then not much impact ,but as a cleanup activity you can remove them so that there will be no issue during maintenance in long run.

Is the User Data Synchronization feature must be enabled for your program? If not enabled, user information will be persisted for just a short period (1 to 24 hours) before disappearing. Ref: https://experienceleague.adobe.com/docs/experience-manager-cloud-service/content/sites/authoring/personaliza...

Which version of AEM you are using ?Reference component is removed from core components  Ref: https://www.aemcomponents.dev/