With continuous stick shaker, all the MAX crews elected to continue their missions with continuous stick shaker.
This is wrong. The crews of both crashed MAXes wanted to return.
E.g. here is just one source
Why do you push wrong information?
All three MAX crews elected to retract Flaps with an active stick shaker. This is contrary to the published Boeing procedure.
If the three crews were not focused on completing their planned missions, why would they have retracted the Flaps?
For JT043, after STAB TRIM was deactivated, the planned flight was completed with the left stick shaker active.
For ET302, at 5:39:06, the FO reported to ATC that they were climbing to FL320. The stick shaker was active.
At 5:39:22, autopilot was selected. The left stick shaker was active and Boeing procedure says do not select autopilot with an active stick shaker
At 5:39:42, Level Change was selected to FL320. The left stick shaker was active.
At 5:39:45, the Captain asked the FO to retract Flaps. Boeing procedure says do not retract Flaps with an active stick shaker. The left stick shaker was active.
At 5:39:55, the autopilot disengaged. The left stick shaker was active.
At 5:39:57, the Captain asked the FO to maintain runway heading as they were having control issues as the autopilot was disconnected. The left stick shaker was active.
The above actions indicate that the ET302 was focused on continuing their mission with an active stick shaker.
At 5:40:00, MCAS began to pitch the airplane nose down. The left stick shaker was active.
At 5:42:10, after struggling with trim due to MCAS activity, the crew contacted ATC with a request for a return to land. This is the request your source cited.https://www.flightradar24.com/blog/wp-c ... -ET302.pdf
While you are correct in saying that ET302 did request a return to land, they only did so after taking actions contrary to Boeing procedure and attempting to climb to a cruise altitude.
With stick shaker after liftoff, the correct actions would have been to leave the Flaps at the Takeoff setting and request a return to land without trying to climb to FL320.