Hi I'm Alex, graphic designer at professional level (don't we all?) since 1996...
I love Affinity, I was tired of Adobe and Corel... They were good but are old, real old.
Personal considerations as for both Designer & Photo: Overprint Preview and SPOT Channel (in Photo also if possible) is a must to get read of Adobe completely because I did keep the Adobe Acrobat Pro for color separations prev.
Everything else are good to have but those two main will introduce you to the pre-press desks.
I know this is hard work but you may consider to have a PostScript type file as your own because I don't think Adobe will ever add the genial Erase layer state into PDF and much more and wee'l have to adjust those.
Sorry for my English
Good job you all!