It seemed obvious to me that was the case, since the original suggested rules were just a big F-U to Tau and Daemons.
As for the actual rules themselves, they are very broad. 40k has hundreds of combos of abilities and units, and this game is the sort that changing something even slightly can have HUGE implications. Playing with fire to change core rules, in other words. The twin-linking thing, for example, is going to cripple some ork armies, and makes some expensive weapons start to be very much not worth their costs. Also, most notably, the twin-linked anti air weapon of choice on most Aegis Lines would be affected, making a primary way of dealing with flyers not work as well.
Still. I see the same examples being referenced all over this board as being the "issue" with 40k (Riptides, Wave Serpents, 2++ re-rollable daemons, etc.). Why deal with the whole game when there are only a handful of things you lot seem to feel are the problem?
My opinion, honestly, is that no change to the rules are going to make a lick of difference here. These are problems with community, not mechanics. But if you are going to institute something, implement it with conviction. Leaderless hordes of players with no sense of community rarely if ever will come to a consensus.