There should be triggers for Google sheets as there are for Sharepoint. I was disappointed to find out that when I was trying to make a Powerapp, that Google Sheets can handle a lot more queries remotely than Sharepoint, which then drove me to using Google sheets. Consequently I'm faced with the lack of ability to create flows for the items that Powerapps dumps into sheets.
There should be a trigger for when:
1. An item/row is created
2. An item/row is updated
3. An item/row is deleted
4. A value of an item is changed to certain values