I was the person who mentioned that the masking is great in Affinity Photo and it is a robust and feature rich application for image manipulation … primarily because it is a modern application and therefore can implement additional features that legacy apps like PS can’t.
Blend options for adjustments, layers etc are particularly good where you can apply adjustments to selected areas of an image without masking…
Firstly PSD and layered TIFFS are Adobe proprietary file formats.
As well the fallacies about image formats, .afphoto images are compact compared to PSD, also you have to remember that NOTHING except Adobe apps will open layered PSD/TIFF with 100% accuracy. Affinity Photo does an excellent job in supporting PSD both opening and saving the adjustments as layers.
You should all remember that layered TIFF is an unsupported Adobe standard and, as TIFF is a public standard, may never be supported by other applications.
JPEG, TIFF and PSD images do not need to be ‘rasterized’, rasterizing refers to creating a pixel image from an image file … an image file is an external screen shot.
Be aware that there a inconsistencies with impleminting external Adobe plugins as ‘automation’, as found in products like ReMask, is ONLY part of PS as it is an internal PS implementation.
Affinity Photo is truly worth consideration as it is a complete pixel editor with exciting modern features. It also supports all that you can do in PS including HDR, Panoramas, Focus Stacking, Live Filters (Smart Objects), batch, etc., etc.
And, bonus, if you use vector editors Designer is a 100% integrated option unlike AI & PS.