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Because many sites (including most of Google's) won't work then ;)

Also it would be very easy to detect if a user is running an adblocker then.

String matching is much simpler than timing and other means. Terse+honest agent strings could also avoid the confusing bloat seen in UAs like Edge.

uMatrix offers a feature to randomly pick a UA every 5 (configurable) minutes from a set of configurable UAs. This works, although GMail might complain about the UA being too old. Reloading GMail resolves it.