I've learned recently that Google Sheets API v3 is being deprecated in favor or v4, and I was wondering if it had any impacts on App Scripts ?
In my AppScripts, I mainly use the SpreadsheetApp (https://developers.google.com/apps-script/reference/spreadsheet/spreadsheet-app), the API change do not seem to have any impact on that, but I have to be sure, to know if I need to migrate those scripts.
Thank you in advance for any insight
As you can see on the Apps Script reference:
G Suite services are services that let you access the data of G Suite products such as Drive, Gmail, Calendar, Docs, Sheets, and others. These services are separate from APIs created for those products; in general, G Suite services are easier to use than G Suite APIs, but are optimized for only the most common use cases.
Those are essentially the DriveApp, SpreadsheetApp, DocumentApp classes among others. They are a high-level abstraction of the API, and they are less likely to change (although some minor changes may occur).
Advanced Google services provide the means to use Google APIs (including but not limited to the G Suite product APIs) within Apps Script. Advanced Google services are really just thin wrappers around those APIs, and are not an API themselves. For more details, see Advanced Google services.
These include the Drive, Docs, Calendar classes among others. They are a lower-level layer of abstraction compared to the "G suite services", and thus are more likely to change.
Since you are using the high-level abstraction in this case, you probably don't need to worry too much.
You may also want to visit the following links:
SpreadsheetApp have been on extending its functionality, but not modifying the existing one nor removing features.