I'm loathe to make firm statements, other than show what's worked for me. In a year from now, my toecaps might fall off, all because I didn't realize the consequences of xyz. Viagra users beware!
I've always applied micro thin layers. Still no cracking after two years. Then I've seen soldiers applying very thick coats, with the expectation that they'll have to strip them later. I guess it all boils down to what your idea of a micro-layer is. Also, some people will stray across the toecap ridge with wax, leading to early onset cracking (EOC). I use Saphir Reno about once a month. I think (but this might be complete bollocks) that it helps the previous layers to re-blend and stave off cracking.
It's people like DWF11 who really know their stuff. They've probably seen it all and know the true consequences. Not me I'm afraid.