Sleep training??

WhTs the point? Well I mean, I get the point 😂 BUUUUT, so many posts about regressions and teething, sickness, etc that put them back at square one. So how does “Ferber/CIO(etc..) method works great, you suffer for a day or two and they sleep form then on!” make sense... Umm clearly not great if they you have to re so the form of sleep training all over. Not helpful 😣