Ah damn
Let’s say the time you will take now will be saved later not consuming too many operations
No it’s not a bug, it’s the way the API of Google Sheets works. If we add one row only, we have to call it as many times as there are rows.
On the other side, Bulk insert is a capability of their API that allows you to insert an array with all elements to add. Before last month, Make was not providing the corresponding Module, but there were workarounds that were leveraging « Make an API Call ». Now it’s officially supported.
So the short answer is: it’s not a bug; if the API you leverage doesn’t allow any bulk insert, you will be forced to insert records one by one.