You dont seem to understand the mechanism and the safety features. i get it because you are just a driver and not a programmer - mechanick. First of all, the factory pop and bangs are created mainly during lift off, where we retard timming and the fuel creates the pops and bangs.
BUT during lift off, the load of the engine is minimized, so with almost zero load, there is almost zero damage.
Now when the tuning box is connected to the car, if there is a lean mixture made by the box, then you have lean mixture not only under lift off (where load is almost zero) but throughout the rev range and when you accellerate your engine runs lean. Thus, increased temps are created in the compustion champer and there is a lot of strength in the engine which looses reliability. When cruising, mixtures of AF/R are close to 15:1 for the i20n, so there is no problem.
Furthermore who told you that pop and bangs dont hurt the engine reliability?
If you do your math and read before you post, you can google and find that pop and bangs create problems to the reliability of the engine and reduce engines life. You can find it everywhere but i just send you a link (
https://stxtuning.co.uk/pop-and-bang-remap/ ). Please before you post make sure that you know what you write because people may trust you and hurt thir engines.