As someone who uses Xojo and Xcode on a regular basis (and I’ve used Xojo for much longer), I disagree with this statement.
I would go as far as to say that if you’re serious about building high quality and performant apps for Apple’s platforms only, you should really consider Xcode and one of Apple’s languages. They might have a steeper learning curve, but the reduction of dependencies and basic Mac like functionality provided free of charge will save you time. If you choose Objective-C, there are decades of sample code, tutorials etc.