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Note that the TS10 used the "old-fashioned" pre-Android 11 way of displaying a PIP window, indeed only allowing for one PIP window.
DuDu7 uses the Android 11+ virtual window programming, NOT PIP-window, which is completely new and allows for more virtual windows.
You compare apples with pears, or better said: pip-window (singular) with virtual windows (plural).
Edit: And don't mix "widgets" with a pip-window or with virtual windows.