Shops are in the business to make money...not saying that all of them are trying to put the wool over your eyes...
...I've had techs look over my W124 and do a laundry list of faults and necessary replacements...the bill of course would total in the thousands if I approved the work.
I would later take the car home and inspect the "suspect" components. Some would be indeed needing replacement (for far less $$$ if I did the repairs myself), and others were a result of lazy or just plain wrong diagnosis...like a leak from a solenoid cover spraying grime on the power steering pump, and the tech identifying the need for a pump rebuild!
2009 ML350 (84K) - Family vehicle
2001 CLK430 Cabriolet (71K) - Wife's car
2005 BMW 645CI (124K) - My daily driver
2012 Mustang V6 (60K) - Daughter's car