Sitecore Support has stated that I can’t install packages like PowerShell Extensions and SXA if my PaaS environment is already deployed. They stated I need to redeploy and add these to the ARM Templates.
As this is an existing Prod environment, why can’t I just deploy to the CMS/install packages like IaaS. I am sure there are some differences as the CMS WebApp is in a separate AppService than other roles.
In essence, what are the differences and proper method for deploying packages like PowerShell Extensions and SXA to a Sitecore PaaS 9.0 XP1 Environment?