@ThinkTank I mean you can allow them to, but the Steinberg VST3 spec specifies Common Files/VST3 as the default directory, and all DAWs scan that by default
If the user uses a different folder, they first had to manually change that in DAW settings. I don't remember the last time a plugin asked me where I want to install VST3, it just did.
For samples it makes sense to ask because they can be anywhere from 1 GB to 50GB. for a 30mb installer, it makes no sense. Apps often install much bigger payloads to appdata without even asking you about it.
https://docs.juce.com/master/tutorial_app_plugin_packaging.html