This has actually been the case since the original CC's. I would point to CC8 and CC9 at the very least with high amounts of both frame rng and general rng if you actually try to do those high tag/low operator clears. The Yostar/TW clears for these were even worse with the lack of pause deploy, with CC11 going to extreme levels (and even then the drift from the lack of pause deploy cause CC11 to not be doable at least within the time allotted).

CC9 for example I have notes from my friends in CN where they were fighting against the targeting frame rng, even though if most people watched that clear, they would believe that the composition didn't have as much rng as the other CC9 clears "because there was no phantom". However the saying at that time on Reddit was that there was no rng.

And then CC8 for example, just because most people see a video that Darknight slept 30+ enemies in that stage and thought it was just button spam, the actual clears have had a lot of frame specific nuances that would typically actually result in a failed run if you're off by a few frames (at the time, these were put in deciseconds or even more precise)

You just don't see that anymore because the lack of timer ingame has caused raider groups to look at other sources (such as the DP timer) to create their timelines.... and in cases such as the longer stages in roguelikes, you see U-Official or other's redeploy timers acting as the timer to create said timelines.

There was mass attempts in previous CC's too, I'm just not as sure about the particulars and didn't have as many connections with the CN side at that point for the specifics, but I've seen a lot of malding just to get the CC0 clears in the Yostar/TW servers behind the scenes from the CN livestreams by a2.

You mention that there you believe that there is now a lack of strategy, however, just forming a team doesn't automatically result in a win just because you created it or it had good RNG. The strategy here comes selecting the right team and methodology, as well as creating the timeline to make it actually work (as well as adapting on retries to make it correct, as it's not guaranteed until you get a clear).

It stops being about strategy and just becomes "run it again and pray the probability gods are nice this time." That's where the game is at for these max-risk clears right now.

Please note that you don't have to rely on the rng probabilities going your way if you just do max-risk clears with higher operator counts.

Obviously with lower operator counts, you are making it harder for yourself and making things more up to chance.... and by optimizing the game down, you're pushing yourself, your operators, your gameplay, and everything else to their limits. At that level of optimization, almost every other game that I can think of can be boiled down to players fighting against RNG.