All of those specialized approaches are interesting and suitable for many projects ... but they do create limitations in certain ways that have to be evaluated, or call for a big investment in technology and procedures that may limit flexibility.

Creativitywise , I prefer post & beam (and arch) construction, as it is very versatile, and more affordable, and classic (read A Pattern Language by Christopher Alexander). This is how the beautiful structures of Europe were built. But it can be informalized and combined with purely organic approaches as well, like in partial ferrocement. Post & beam construction for major architectural features, along with arches, go up to define the entrances, spaces, windows, rooflines, and then this frame work is filled in eclectically, allowing for spontaneous expressionism and curvaceousness.

It helps to have lots of time & patience and a lovely natural site... so that the work can become play, and an interplay with the energies of Nature at the site.... somewhat spiritual and not entirely planned in advance. It does take a natural skill at building to build this way and not end up with some unusable or regrettable spaces... but I've not really had this problem.... and I suspect that anyone can manifest a reasonable level of competence (sometimes takes unlearning overly-reductionist thought patterns).

At first Nader dried blocks of adobe, about 4" thick, and stuck them together with wet clay, and hay... Then he would stack dry blocks without mortar in the windows, and stucco the outside of this. Firing this room for days twice.... Then he developed a way to use endless sandbag tools to coil build mud and or sand, or dirt in a spiral. I think he used barb-wire to create a kinda glue between layers.

>>What is the medium used to "stick" it together ?<<
We stabilize earth depending on how well it performs under compression. It also depends on the composition of the native soil. We commonly use a small percentage of cement or lime in our mixes. The min. compression strength is 300 psi. Some earth is this stable without adding anything other than water. As previously mentioned barbed wire gives tension and friction between the bag layers.

Mars one was the first sandbag structure to be tested for seismic shear strength. The engineers performing the test were forced to shut down their equipment because the structure wasn't giving and the hydrolic jacks began to buckle. Mars one was built from nothing more than raw earth and a little water.( outside of grain sacks and barbed wire)