Most people aren't hiring professionals to put up shelves lol. And there is no "how to deal with the wall". It's fundamentally weak. Best you can do is Rigifix M8 bolts which are rated to about 25kgf as I said.
Those seem to be for drywall. The strongest option is using resin to install some threaded rod, eg fis-v which is rated to 43kgf (shear load) in the lower of the two rated aircrete classes. That's because it spreads through the holes and therefore has a larger surface area of interface. The downside is that it's not removable.
That seems really low for shear. The M8 Rigifix say 245 kgf for 1mm displacement in shear.
Also I slightly misremembered the rating for pull-out - actually in 34 kgf, and they are applying a fairly generous 15% safety factor (i.e. tested ultimate strength was 224 kgf). But still, it sucks that you can't just use a normal wall plug and have to worry about this sort of thing.
That's 0.43 kN which is 430N or ~43kgf. Comparing to the rigifix table they are using a heavier aircrete and a smaller safety factor, which would take fix-v up to 80kg but that's still a big difference. I wonder if there is a testing methodology difference, as usually resin fixings are considered stronger than plug fixings.
If it's just a threaded rod held in with resin then I expect the difference is in the hole size. The actual wall plug for the M8 Rigifix is 16mm diameter. Also the M8 bolt is inserted into a larger metal sleeve so it's less likely to bend. I don't know if that affects things though.
