The hidden reason why so many people are frustrated with 'modern design' that goes unaddressed is that most software nowadays completely ignores the standards of the system it runs on. Every single developer of even the most trivial apps insists that their design language is the most important in the room, which is what brings us to the temptation of using a webapp for everything so every user on every OS sees the exact same thing. It's gotten so bad that the only places I see native system UIs from third parties is either older software or hobbyist projects, but never anything corporate.

As a user of both windows and mac operating systems, I'd rather the app be consistent between them so I don't have to adopt a different workflow depending on which OS I'm using the app on.