Absolutely not true. I tested dozens of apps when side loading worked and I think I found maybe one app with a problem that could use some optimization. This is a fallacy. Apple did a really good job on the emulation layer; iOS apps just work fine on macOS.
Most of the apps I tested -- ones I use all the time -- were blocked by the developers once apple enabled this. So now I have lost the ability to use these the apps on my Mac. And there was NO NEED for them to optimize or rebuild. All the developers had to do was not block.
I get that developers don't want to support Mac users, but as I said in my previous post, many users may begin to use one of the platforms that allows them to side load. When they do that they will STILL ask for support. And the developers won't know if they are legitimate support requests or not; so will likely just offer support. And users who use the side load platforms often don't bother paying for the app -- because that is possible with these workarounds. So how is this better for the developers who STILL get support questions and IS NOT getting paid? And also this is clearly worse for the users who generally prefer a legitimate App Store experience.
Developers who are thinking this way really need to think this through logically. It is non-sensical to actively block an app from being used on a particular system the customer owns. Especially when there are workarounds that are much worse for everyone.
In all honesty I don't see a need for this. I tested dozens of apps when side loading was possible, and the trackpad worked fine for me. Having to move my hand up to the screen and touch it would be awkward and uncomfortable. Obviously there are some applications that require a touch interface...
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