To crash the tech, you have to pay a very large sum of money, wich is balanced based on how much you still have to research in that line.
Money is, at the moment, very easy to come by at the moment. It will be fixed, but I'm sure it will still be quite easy to obtain. Crash research is still cheaper than buying the tech, even though it takes slightly longer, you get 2 advances at least, usually.
To crash the tech, you completelly stop researching ALL other lines. Everything stops!
How much would you have actually gained in that limited amount of time it takes for you to jump 2 tech levels in an area?
There is also a degree of randomization in it, that you have no control over.
True, but generally a minimum of 2 research areas early on, which is a HUGE boost.
Crash research is not instantaneous either.
Its a situational option the player has at his disposal that is balanced by paying money and completelly stagnating the research of other areas.
It gains you nearly instantaneous access to the first hostile world colonization tech, which gives you a MASSIVE amount of new colonies to choose from. Colonies gain you money. Money gains you crash research options. Etc, etc.