Affinity Photo file size

A few years ago I tried Affinity Photo. I was very impressed with the way it worked, but was most disappointed with the HUGE file sizes it produced in when compared to Photoshop, they were all 6 or 7 times the size I would have expected. For this reason, and this reason only, I stopped using it, my hard discs would have been full in no time at all. Nothing I did would reduce the sizes. Affinity were unable to help at this time, other than giving me a refund.
Does any one know if this problem has been addressed to date please? TIA.
Does any one know if this problem has been addressed to date please? TIA.

If you remember to export (as opposed to 'save') the images, then you can choose the file format - jpeg, tiff, or whatever you choose. Files are then never any bigger than they would be in other software.
Saving an unflattened image as an afphoto, will, as stated above, greatly increase the file size as this preserves all the layers and the file is not flattened.
Saving an unflattened image as an afphoto, will, as stated above, greatly increase the file size as this preserves all the layers and the file is not flattened.

I'm just guessing. But being an Apple first product they adhere to the document format in macOS. So basically you have previous versions even when you move the file around. There are tools to remove them. For me personally I love being able to undo or even bring ideas from the past history of the file and paste them into the current version.