The answer to the export problem that dogs every web-first tool. Plus AI installs as an add-on inside Google Slides and PowerPoint and does its work there, so what it produces is an ordinary file that anyone can open, edit and reformat with no conversion and nothing lost. It generates whole decks from a prompt or a document, rewrites individual slides, and will restyle an existing deck to a new template.
Because it works within the host app, the layouts are as good as the template you point it at rather than the inventive designs Gamma produces. That is exactly what you want when a deck has to match a corporate template or be handed to someone else to finish. If your organisation runs on Google Workspace, this is the one to try first.