I think shuffle mode should be the default setting for every game ! Makes such a difference into replayability and playing THE GAME and not A SET OPTIMIZED STRATEGY….
Now, 'Shuffle Mode' is an example of a purely Game Mechanic that sets my teeth on edge.
It bears no resemblence at all to actual technology development, but simply makes the game more 'replayable' for those gamers who think being unable to predict what happens next = playability. It actually = Chaotic Unpredictability, which is completely unrealistic and the anthesis of what humans have been trying to impose on the world since they came out of the trees.
Shuffle Mode is a substitute for a more realistic model of Tech Progression. I fully undertand the reason for it: modeling tech progression is Hard if you try to do it right. The old saw that X follows B which follows A in a nice, straight line of 'progress' is a complete Crock: people in various parts of the world developed entirely different ways of achieving the ends they desired and skipped those that they didn't need. I could go on interminably with cases, but two will do:
1. Mediterranean Europe developed relatively high-temperature charcoal-fired furnaces and smelted wrought iron for tools and weapons, but never developed any higher-temperatures that would have given them cast iron until almost 2000 years later. China developed cast iron and used it for tools, weapons, and decorative objects over 1000 years before Europe, because they had access to clays that included a metallic content that when fired at high temperatures, gave them Porcelain (an Extremely Desirable luxury and trade good) - so they developed bellows-driven 'blast' furnaces to produce those high temperatures, and discovered that it not only allowed high-temperature ceramics, but also liquified iron and allowed it to be cast.
2. Bronze was the first metal (alloy, actually) worked that was hard enough to produce saw teeth that wouldnt wear to nothing after a few cuts. This allowed people to cut across the grain of wood and this, in turn, allowed them to cut smooth-edged planks that could be fashioned into solid round wheels. Since Europeans and Asians already had access to draft animals like donkeys, horses and oxen, wherever Bronze appears in the archeological record, either discovered or traded, wheeled vehicles appear as well. Bronze and Wheel are Related Technologies: one requires the other, at least from the evidence so far.
- And contrary to popular belief, the native Americans did a lot of metal-working: copper, gold, silver, arsenical bronze were all smelted, fabricated, and cast - including the relatively sophisticated 'lost wax' method of casting. But the most sophisticated bronze work seems to have been among the cultures of the Andes (pre-Inca and Inca) which, by sheer Bad Luck, did not work wood very much: they were experts at forming stone of all kinds, but had relatively little access to massive amounts of forest - so they never developed bronze saws, and having no draft animals of any size, never had any need for large wheels, even though they were perfectly familiar with the wheel (there are both Aztec and Incan wheeled toys in museums, but nothing larger).
In other words, for some very Basic Technologies: bronze and iron working, the wheel - there is no single, clear 'path' for your Tech Progression: it depends on the individual group's needs and other situational aspects: is wood or stone or clay their basic building material? Do they have other needs for the same techniques that can be applied to metalworking or Wheel? (and note, Pottery techniques are tied into early metal-working: the same kiln technologies were developed and used for both).
The simple 'Tech Tree' is simply a Bad Model - but a completely accurate model would probably resemble a Tech Kudzu Vine and drive many gamers quite Mad with its apparently-chaotic nature. As usual in game design, a compromise has to be found between Reality and Mindless Simplicity. Merely Shuffling is not that compromise.