737 has 2 primary ADI’s (Attitude Director Indicator) and one ISFD (standby). The ADI’s form part of the Primary Flight Displays (PFD).
MAX PFD
IFSD
There is not really much feedback (except for louder noise if you’re going faster. Some of the flight controls have artificial feel, but are all powered.
The 737 has inputs to move the stab trim in various flight regimes independently of the flight crew. The MAX has additional system called MCAS, which is believed to have driven the stab to full nose down as a result of faulty data from the alpha vane.
There is a procedure for runaway stabiliser (which this would have looked like). Whether they did that procedure is unknown.
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