I'm gathering from your posts that you're more of a simulation gamer than a strategy gamer.
Strategy gamers make up the most of this forum. We like choices, and games are all about presenting the player with choices. The sum of our choices are what makes us win or lose. Technology being a static tree appeals to strategy gamers because it allows us to decide what we want to research to fit into our master plan. It makes the game feel more like chess really.
The simulation gamers on the other hand, love to see systems work, as well as optimize them and fix those systems when something goes wrong. They take the pieces they are given and build something that works. Games that appeal to these types of people are more along the lines of Sim City and Dwarf Fortress.
Both approaches have their merits and I myself enjoy both styles. I love roguelike games where the game places you in a random world and expects you to carve your own path. I just can't see techs in a game like this being fun when random though. I can't wait for Legendary Heroes where they will remove random traits. Random character development is just not something I like in an RPG, which this game is partly. The same can be said for techs if you consider the character development as a faction whole.
As for your statements about it being optional, I don't think it can work. Game design in most cases needs to take decisions like this into account early in development. Games like Alpha Centauri and Star Ruler took the random tech idea and based their games around it. Fallen Enchantress did not, and it is way past the point where the game can be changed in that way without being part of a new expansion. It takes time and money to implement features like these, and most of us believe that Stardock would be much better off improving other aspects of the game.