well, I know that many of the comments now are pointed to the builders part of the community, well my answer is this. I don't like building in creative mode, this might come out as weird for a person who's more on the edge of building rather than mining, or even redstoning. For me the creative mode is useful only and only for designing buildings, and nothing more, to smooth out the concepts I made in my head, and unlike many creative builders, I only fly to experiment the build, and then I work around and walk and develop building techniques that I'll later can use for survival, rather than continuously flying, I even device scaffolding etc, and jump around to see the usability of the scaffolding and other stuffs, in short, building like the way I am now, building in survival. The restraints on building things in survival makes me conceptualize structures as usable buildings, not as sculptures which resembles a building, that is two different contrast of design philosophies there. You hate having unlimited resources? I do as well, what is the fun of building a large-scale without realizing the scale and the hardship involved in acquiring the materials as well? The farms actually only have minimal impact on my building style, go check out what Leeuwenhoek is made of. And the cobblestone generator, if you don't know is actually a lot of hassle, you have to stand by because every two minutes, your pickaxe break, and so you have to either scroll or punch a number to get working again.
I actually also scorn the idea of the iron farming (from the developers, not Gerdih) especially because it takes a lot less of a hassle than it does to produce stone bricks, I mean hello? Stone are dead cheap, many people throw them away, heck when I was building the first Leeuwenhoek people gave them freely because they are as cheap as dirt, and then farming and processing them still takes a lot of hassle and I was once online for 6 hours non-stop in front of the laptop because I can't go completely AFK, I'm AFK only because I am not allowed to touch the keyboard except to change the pickaxe. Such an important and ludicrous resource as iron should be way harder to produce, and incurs much more of a hassle than stone farming, but the developers simply give us, well, that. An iron farm is absolutely harder to build, but right now, it is absolutely maintenance-free, it is the absolutely most easy mechanism of farming available in the game because it is just a mob-farm, even farming cows is harder than that! And we can't really blame players who want to build those kind of farms, I mean if we don't have iron golems and witches we still do build farms for food and some materials (wood and cobbles), but once the devs decided to put in mobs which drops loots which is supposed to be rare, and actually highly useful, it is inevitable that somebody will try to build a farm for that, well actually, once the devs introduce a mob that drops diamond, the game is, for all purposes, broken, nuffsaid.
I would love if all farms have to have mechanisms such that is required by shootingiron's cow and steak farm. You have to punch buttons, retract levers, go to the cows and mate them, etc. etc. and feels like doing actual work in a factory rather than sitting around doing nothing and wait for the mobs to spawn and die for you. But the devs only gave limitations to mob-farms as the size, and only that, and nothing else, what do you expect these kind of farms will look and work like?
You don't like these kind of farms? there's only limited options that you have: 1. ignoring it 2. use only those versions that don't have these high-price-loot mobs 3. make a no-farm rule, which is quite hard to argue for because they don't utilize bugs.
On another note, because emerald can be easily obtained from farmable materials, how about having a rule where no villagers who sell diamond or diamond-based items should ever be let to live? I think this is a serious game breaker, and will bankrupt pretty much everyone if they're let to live and somebody trades with them.