Yes, it is a typical post, where you say something stupid, stick with it for multiple posts, then pretend you didn't mean it in the first place. They replaced two gearboxes, there is no confirmation anywhere the second one was a complete failure, it probably was, but Merc specifically told everyone the Tuesday one was a failure and from every comment I can find they haven't said it was a failure but a glitch. But as per, you know better than Merc, I'm merely going off what Merc say.... in the future I will ask you what failed on F1 cars as you have better info?
They are all new engines... I don't even know what you mean by that? Are you saying they use a new engine every day? None have done anything like the distance in season, more drivel? Merc confirmed as did sky and everyone else that the engine that went on the Merc did 6 days of testing in bahrain, as said this was 500+ laps and WELL over 5 race distances before it went.
There comes a point in every test where different things are most important. No one ran 100% engine speed at the first test, overall laps and testing other systems was more important, there was a reason Merc tried 100% and qualy runs towards the end of test 2, because while that wasn't important in the first week, it moved up the list of things to try in the second week despite the fact that the engine could have gone and ended testing for the day.
Likewise in the third week towards the end of testing Mclaren, Williams and Merc had their biggest failures....... engines going, confirmed using old parts and happy to find out they failed beyond what they were expected to do, but the teams don't use old parts and risk losing testing time do they. Merc had gearbox failures, so did Mclaren, Red Bull, Ferrari(that I checked in to, most teams likely did).
To assume reliability and not knowing how long an engine or gearbox lasts and wouldn't be tested...... in testing, because you might lose a day.... but they would test this in the season when they might lose an entire race, belies your understanding of the word TESTING. The very reason for testing is so you can test things without the risk of ruining a race. You WANT problems to crop up in testing ahead of the race.
So I think we can sum up that you're wrong on most counts, we KNOW for a fact as confirmed by everyone out there that Merc and Williams have had engine failures FAR beyond what those engines would have been required to do in season, we can presume Merc's first gearbox failure had also done beyond the required distance. We know that Williams and Merc(and likely all teams) ran older heavily used engines for large parts of testing despite the massive risk of losing time. This pretty much tells us for a fact the teams value data on failing parts as much as anything else, it's crucial to reliability, having an idea, in fact solid data that can tell you how much life is left in a part can easily be the difference between winning a constructors title and coming way down. If you can be reasonably sure a part will fail before the next race distance, a 10 grid penalty is a hugely smaller penalty than not finishing at all.