"Which brings us back to the original point: How to reach those 50k. Of course if you make numbers and realize you won't ever reach 50k it's useless to throw away radars for 15 SR levels and two namins. What I was trying to point is that those radars won't give you any more advantage next event..."

This is absolutely and blatantly false, though. Slayer cards give radars a significant boost. If you don't have any slayer cards this event (or just the N ones), and think that you can get a slayer card or two in the next via whatever means (even the free e-gacha tickets), then they sure will give you more advantage in the next event. Plus, those stacked with the ones you get through that event means 2x the bouquets anyways. Stockpiling them for the next event is far, far better than throwing them away for no gain whatsoever (and not just no gain, but you are actually taking a loss since you lose a lot of other actually useful items in the process). If you have a chance of reaching 50k with them via momentum? Sure, you're definitely better off using them. If there's no way in heck you are getting 50k this event no matter what you do? You're better off pushing for level 200, collecting the extra keys / prizes / bonus rolls, and save the radars for when they can actually provide a valid edge.

It comes down to one very simple fact. If, within the first day or two of an event, you realize that you have no chance of pushing for a reward no matter how hard you try, then it's not worth wasting your resources to fail at it. That means that you not only fall behind / lose momentum, but you are more poorly placed for the next event because you squandered your stockpile for no gain whatsoever. The advice is good at its core, but then you push it to illogical extremes that make good advice become terrible.

PS: My hoarding my peroanamin stockpiles for the last two events has paid off marvelously for this one. An actual example of why your advice taken to the extreme you are doing is just not good. Free-to-play means that you have to be incredibly wise about your resource usage. That does not mean "frugal". You need to be willing to burn them when doing so will benefit you. You just need to make sure that it is actually going to benefit you.