Proton car is budget car. least cost to produce or plus the duit copy to top management to cut alot of cost so they money can into their pocket. that why some of part of proton is inferior.
They never done so much on R&D that many model of proton exist and more than 10years for instance waja perdana and old saga (only with change with some new face lift).
so no complain lo. proton putra simply is just a re badge of the Mitsubishi mirage(so lower default rate).
In general higher price higher quality lower price lower quality(for any product phone computer and etc).
As for new proton saga blm gen2 persona,and neo, exora. proton definitely have perform better then before of the handling, quality, etc. They are improving.But for safety no comment, the construction of steel is still needed to improve.They never sent to NCAP test for saga blm gen2 persona,and neo, except exora 4star in ncap test no bad.
Some car had design flaw such as subaru gc8 gearbox 1st gear is too thin easy to break when the car is laugh frequently.even 2008 GTR the wrong design on the computer program on it SST gearbox and result the gearbox broke down.
But as the sometimes some of batch of the car production(some of part is manufacturing by outsourcing so if the outsourcing company did not produce well or had design problem and the car company which order did not check properly), had default for sure like Toyota hybrid car in US have recall back to change the part and so on. even few year back i bought toyota vios UMW also call back to change the car alarm system(no charge at all obviously they knowing is they fault). Even the new hatchback impreza in US the owner buy the car just about 2 month and mileage only 5000KM the engine broke down(bearing failure).
So nothing is right or wrong, to prevent


then we should buy the model of the car based on the the best of customer satisfaction, simple word it mean no need so many maintenance very few default and etc).