I'm very new here and keenly aware of the pitfalls of contradicting a mod. However, after trying to integrate Affinity Designer into a professional workflow for more than two years, I have come to the humble opinion that it is a steaming pile of poo.
Firstly, it lacks some very fundamental vector tools. Of these, the most glaring is the omission of any kind of vector distort tools. This means that trying to impose any type of 2D graphic into a photo or other 3D environment is at best horrendously time-consuming - at worst impossible. It also lacks other basic tools like a knife tool.
The most worrying thing is that when I first bought the app these things were at the top of the development roadmap, but over two years later literally nothing on that roadmap has been implemented. In fact, with the exception of a few cosmetic changes, no meaningful development has happened with this app for over two years.
Did I mention that despite pleas from the user base, Serif still hasn't implemented lines with arrowheads? Or that the outline stroke function produces hilariously unusable results. Needless to say, there is no offset path.
However, the two main reasons that I would discourage anyone from investing time in learning this app are: Serif have already abandoned development on a previous suite of design apps and I wouldn't be surprised if this also happens in the future with the Affinity suite. Secondly, this is not the industry standard. Although printers or web developers will be able to deal with with the files which Affinity experts, in 99.9% of cases, handing over an Affinity file to another designer is going to cause a major problem.
Personally, I'm back with Adobe now and the time I save by using it more than compensates for the increased price. Yes, it's more expensive, but at least it's still being developed and is fit for purpose. I guess we get what we pay for.