What you are claiming is that - short cuts and shoving the problem under the carpet is 100% equal to "manufacturer service standard"
this is the exact kind of mentality/concept that has led the "dumbass revolution". Where proper buses were replaced with elongated ricksha converted to buses - because "kaam to chalta hai na"
let me tell you a few simple maintenance steps - which have proven themselves worth over a few decades of service, lets take coolant, When GM and Texaco/Chevron (aka caltex for you) jointly developed their dexcool coolant (OAT type), it was quite a new concept. It is an exceptionally good coolant, when maintained correctly and 100% sure that no air pockets exist it does provide a 200,000 kms service life and when you drain it out after that time, it will be clean as the day it was put it in and the cooling passages will be like fresh out of the foundry shiny.
It will have absolutely no scale, rust, buildup, cavitation damage, corrossion etc. Your car was also filled with such and the caltex orange you buy is also the same dexcool type. - Infact if any coolant mentions long life, extended life etc, its mostly an OAT type and very close to the GM dexcool.
point to say is that the manufacturer provided you the spec to make their machine run 100% - now if you are too poor or ill informed about this and your mechanic is a hack job with sloppy tools and zero working knowledge and fills it with "baba ke dumm ka paani" claiming "ye koolent shoolent bewaqoof bananay ke tareeqay hain" when he drained your Rs 4000/- worth good material into the ground (because he's too poor to cut a container to catch and reuse it) dont expect the original service life.
similarly lets take head bolts - the reason to use TTY bolts is that they stretch and remain stretched when tightened. This eliminates the requirement for retightening the bolts after a period of time as the bolts on modern compact heads are usually hidden by other parts and the other chief reason is they are cheaper for the manufacturer (for user too)
when ustaad tries to "double vaashur" the bolt - he's actually reducing the thread count that holds the bolt in the block and as the bolts are already stretched (the threads also deform) - its a serious hit or miss and usually ends up in problems. The head face love affair is also the same boat, when you face a head which is supposed to use a steel gasket, the surface should be really smooth 50 Ra or better, which is smooth like the side of a piston - your fingernail cannot catch it and it does give out a rainbow shine when light shines on it.
The ustadee may end up in a service spec that matches 40% of the original service spec but that is no reason to claim that it works exceptionally well - your exceptionally well can be useless standard to other people - that is why you have a defined specification and procedure - which usually is set by the manufacturer.
like myself - when I repaired a car, it was handed back in actual factory service spec. If the car was neglected for most of its life, the repair bill was usually big - but when it was done the owners actually could "see" what the service spec meant, and they used their cars as transport rather than worrying about it breaking down. Service spec doesnt mean - check paani, haail, brake haail every day, and perform ziarat of ustaad every 2 or 3 weeks for brake mein awaz, falana oil leak etc.
Do a job once, do it perfect - there are more things to worry about in life than your car.