Bikes without ABS loose value in rapid pace.
If there were an ABS retrofit package that you could install on older bikes (and get a registation, ABE..) it would sell better than any other accessory on the market.
I can't say if the depreciation issue that you claim is true where you live, and you offer no support for your statement, but I don't believe this is at all true here in the USA. Of course, ABS is not currently required on new motorcycles in the USA, but is available as an option on many. Cosmetic condition is a far larger component of value, here in the USA, in my opinion. If and when ABS is required, and is recognized by insurers in the form of reduced premiums, perhaps what you say will become true.
I am dubious that a safety / legal compliance related accessory would be a big money maker here in the USA, where the top selling aftermarket items are (loud) exhausts and add-on ECU modifier gadgets. Both of these items, incidently, often being sold with the disclaimer, "legal ... only for racing vehicles which may never be used, registered or licensed for use upon a highway."
My point in my last posting was NOT that ABS is not generally beneficial, especially to beginners and less skilled riders. I believe it is. My point was that failure of ABS systems can, and likely has, caused injury and perhaps death. Certainly there are also many cases where ABS has been beneficial, as per the links you posted. Testimonials are not statistical evidence. Statistical evidence supports a general conclusion, that ABS is, in general, a benefit, even in the old studies, and this is why ABS has increasingly been adopted.
I don't personally care for ABS systems, because its presence negatively affects reliability and substantially increases repair costs. ABS braking systems contain all the elements of a conventional hydraulic system. Master and wheel cylinders can fail, hydraulic lines can leak, and fluid can become corrupted and cause internal corrosion in both ABS and non-ABS systems. But ABS systems also contain additional sensors, electrical wiring, connectors, pumps, valves, and electronic controller, all of which can and do fail. All these additional failure modes exist on top of base reliability issues with a conventional hydraulic system. If parts aren't present, they can't cause problems, and I don't need to spend money fixing them.
The million+ vehicles recalled for ABS system defects confirms this point:
https://www.torquenews.com/3769/ford-recalls-600000-vehicles-keep-brakes-failing-due-sticking-valve https://www.carprousa.com/Hyundai-&-Kia-Fire-Risk-Recall-Expanded/a/1593 https://www.motorsafety.org/tag/hyundai-anti-lock-brake-recall/ https://newyork.legalexaminer.com/transportation/nissan-implements-third-recall-of-400000-vehicles-due-to-abs-issues/ https://motorsportsnewswire.com/2020/08/10/indian-motorcycle-recall-of-certain-scout-motorcycles-equipped-with-anti-lock-brake-systems/ https://www.consumerreports.org/recalls/harley-davidson-motorcycle-recall-brakes-abs/