In most countries the regs normally spell out the owner's obligations regards the maintenance.
It is normally the owner that is responsible for ensuring the aircraft is maintained in the correct manner. My experience has always been that the LAME or A&P desires a greater depth that many owners are prepared to accept.
There would appear to have been many owners/operators that wanted Sched 5, AC43 App C, or similar minimal levels that are perceived to cost the least.
The SID's has highlighted the aging aircraft philosophy for many and all the Pipers I currently work on are maintained to the manufacturer's schedule with the SAIB's and SB's being used for the preventative tasks.
Piper PA-28, PA-32, PA-34, and PA-44 Corrosion SAIB | AMT Community
https://www.faa.gov/aircraft/safety/alerts/SAIB/
Here is the listing for a 140..
PA-28-140
CE-11-14 01/05/2011 Stabilizers- Vertical Stabilizer on Piper PA-28, PA-32, PA-34 Forward Attach Point Corrosion
CE-11-13 01/05/2011 Wings - Piper PA-28, PA-32, PA-34 Forward Spar Corrosion
CE-10-17 02/23/2010 Landing Gear - Piper PA-28 and PA-32 Main Landing Gear Torque Link Inspection Interval
CE-11-42 06/29/2011 Flight Controls: Control Cable/Pulley Inspections
CE-11-10 01/05/2011 Piper PA-28, PA-32, PA-34, and PA-44 Corrosion on Flap Hinges, Brackets, and Ribs
CE-09-23 04/07/2009 Fuel: Piper PA-28, PA-32, PA-34
CE-09-17 03/10/2009 Fuel: Piper PA-28 Series Aircraft Fuel Vent and Supply Hose Condition
CE-11-01 10/04/2010 Stabilizers -Horizontal Stabilator – Turnbuckle
CE-11-11 01/05/2011 Wings - Piper PA-28, PA-32, and PA-34 Aileron Hinge Fitting Corrosion
CE-11-12 01/05/2011 PA-28, PA-32, PA-34, and PA-44 Rear Spar Corrosion at Fuselage Attach Fitting
CE-13-26 03/27/2013 Engine Air Intake System; Air Box Vanes
CE-14-22 07/10/2014 Fuel Selector/Shut-Off Valve
CE-14-23 08/06/2014 Powerplant; Air Intake
Again, I think all the owners would subscribe to the free notification and publication service offered by both the FAA and Piper.
Those guys, at least, have been proactive and should have an inkling of any plans Piper may have for the future re-write of any schedules.
The beauty of many of those inspections is that a regular spray of Inox or similar would go a long way to big savings later on down the track.
Surely there can't be many owners about that are just ignoring this basic stuff.