Low probability compared to what though? This makes less sense to me on closer inspection. I agree that there may be some meaningful observation in there, but it's hard to even figure out what the paradox or observation is.

An individual (or hive mind, whatever) living in the year 300,000 AD may very much dispute the claim that progress has stagnated. It's entirely possible that civilization has continued an exponential expansion (within limits) from now until then. As such, history is one continued exponential.

Provided that this civilization still is not bumping against the thermodynamic computational limits of space by several orders of magnitude, then the Fermi paradox is still a paradox.

That's how an exponential works, every point sees itself as a privileged point, right before it increases massively.

Right, on one hand I feel blessed to be alive, as with all of you, in what is certainly the most important time in human history. Beside the effects of every technological advancement which currently exists at a transitional period, the greatest moment of birth and rebirth in history could be upon us, thanks to the Holocene extinction event we have triggered. Whether or not we capitalize upon our special place in history remains to be seen.

But I also know I'm missing out on the true space-faring age, the Humanitarian Revolution, the Quantum Age where we begin to fully exploit the laws of QM, the Last World War, extra-solar colonization, etc.

Eventually, if we don't kill or exhaust ourselves with impatience, technology will be solved with respect to providing enough energy and resources for every conceivable human. Then, the real challenge begins. Providing for a population beyond its basic needs becomes an entirely political affair. We may be arrested on the lower levels of Maslow's Hierarchy of Needs for quite some time.

Will humanity observe a similar exponential advancement in humanitarianism as it has with technology? How important is humanitarianism to Fermi's Paradox and the Drake Equation?

Enough energy for every human individual is already a solved problem, although not necessarily sustainably. It's not even economically prohibitive to switch to sustainable options, there's just insufficient incentives at this time. The great travesty is that, when incentives are put in place, the Holocene damage will be difficult to stop and impossible to reverse.

Our own survival chances seem to be a fraction not close to unity, but not close to 0 either. Give it 75% to be optimistic. After that, robotic seed space ships could be a buffer to protect from subsequent cataclysms. That does nothing to answer the questions of Fermi's paradox, unless you low-ball to 1.0e-6% chance of survival. Doomsayers guessing such a number are not generally taken seriously.

Looking elsewhere, we have almost unlimited wiggle room in the chance of photosynthesis evolving. Traits that evolved multiple times in Earth's history are inadmissible to this discussion, but several critical traits evolved only once. Fertile but desolate planets are, based on current science, probably abundant. As a typical reasonable human, this is a perfectly sufficient speculative answer.