Correct links within office files
Some users might have Excel or other office documents with links within them that rely on the SharePoint environment where they are located. Sharegate doesn't currently modify these links to the new environment, and this can cause some integrity issues.
It would be fantastic if the tool could do this, and I don't doubt it would be a difficult addition. Often you have scenarios where people have linked Excel Spreadsheets using formulas. Being able to copy/replace these links during migration would be fantastic. I guess the current option now is to look into other tools like Cognillo SharePoint Essentials Toolkit which looks like it can also do a lot of what ShareGate does.