Said more neutrally, Safari is far behind all the other major web browsers in standards implementation and dev friendliness. As an outsider, I also assumed this was to preserve app store revenue. If it's not, could you share some insight on why it happens?
“Far behind” is perhaps an overstatement, especially today. Things have rapidly improved in recent years, with a _lot_ of time and energy being spent on spec compliance and interop (see https://wpt.fyi/interop-2024).