Respectfully, that's blanket statement and not always true.
Here we are again where it largely depends on the bodybuilder. It is just as easy to over-indulge on carbs as it is fat (or protein for that matter which can ALSO become a problem for the true keto crowd, but that's a different issue than the one at hand); thereby disabling one's attempt to enter the coveted land of ketosis.
Compounded by the dynamic that a keto bb'er inarguably becomes more carb-sensitive over time from a cummulative effect of said practice, when muscle and liver glycogen levels are super-saturated from irresponsible carb refeeds/carb intake; lipogenic signaling commences no differently than for a non-keto subject as you know.
Hence, the circulating carbs (largely glucose at this juncture) will spill over and the ensuing glucagon-insulin balancing act persists for days, not hours. From this, ketosis is much harder to achieve. Atkins belabored the principle of Phase I (zero carbs) for WEEKS (not days) for the purpose of entering ketosis for this reason; by virtue of eradicating all "sugars" in the system. Manythat failed, did so b/c they could not get into ketosis largely b/c they were overconsuming protein sources (or of course, were simply too ignorant about macro choidces), but as discussed above, that's a dfifferent discussion for a different day.
Back on topic: While I concur that ketosis has its place, many bb;ers assume they are successfully reaching ketosis, but come up short. God forbid they purchase dirt cheap keto-sticks to assure this state of ketosis, but I digress.
Good point on the parathyroid, but I disagree that high protein diets will automatically lead to issues. No different that one bber's ability to consume 500 grams of carbs per day and (somehow) getting lean, others ingest copious amounts of protein daily without related stresses to their kidneys or parathyroid. You know the drill, genetic programming/dominance trumps most things. That said, I concede your point as I do about calcium and it's role in mitigating acidic responses, but would argue K+ or even citric acid based supps for that matter do well to favorably increase the alkaline/acid balance.
Your statements about leptin are correct to a degree, but somewhat misleading. While it is not the villain, it is arguably one of these most adversely manipulated pathways from (improper) dieting and leading causes for long term metabolic slow down and recalibration of one's daily caloric needs (especially noted in "chronic" dieters). It also plays a role in the release of other potentially helpful metabolic hormones (thyroid and GH to name a few), and as such, only further substantiates its role and one's needs to to best-attempt fat loss methods.
(Carbohydrate-specific) refeeds on keto diets are crucial to ameliorating problematic leptin levels in that they reset leptin levels and one's long term success is related of course. All the while avoiding permanently lower thresholds of maintennance calories. Keeping in mind that universally speaking, no matter the diet employed, the more bodyfat, the more leptin. Conversely, the less bodyfat, the less leptin. That said, acute bursts and decreases are also observed and these can be manipulated to gain an advantage in one's overall success with triggering lipolytic pathways.
I'd be remiss if I did't include information for females followjng this thread. As a rule, women have higher leptin levels due to their naturally higher bodyfat levels but to base any dietary strategies on this would not be prudent as this becomes a strategy of relevance, not just numbers.
With respect to your comment about my ability to grasp, nothing could be further from the truth. LOL
Thank for adding to this discussion; but let's keep it respectful.