1. Even on the most high tech imperial worlds, technology rests in the hands of a privilaged elite. Even then, the only people who really know how it works are the Adeptus Mechanicus. A guardsmen might know that a certain cleaning/maintainance procedure is neccesary to keep his lasgun working, but if it actually breaks, he needs to take it to an enginseer, because he will have abseloutely no clue how it works.
Things like the Ordo Xenos are an exception.. If you find a fluff example of a radical ordo xenos inquisitor who feels the technology he is privilaged enough to use should be available to the masses or bought into common use because it's 'more effective', tell me about it.
2. Because they control technology utterly (not just the devices.. they control the skills. In fact, their devotional rituals are the skills.) the Adeptus Mechanicus decides when a certain piece of technology should be improved or assimilated.
3. The Adeptus Mecanicus have a categorical religious proscription against alien tech. They believe that using it will taint them.
So expecting the Imperium to adopt alien weapons and technology really is like expecting a christian (or, in fact, a whole sect of christian priests) to make a deal with satan. It's not going to happen.
There is room for a few crazy tech priests/planets/inquisitors to try it, but only if one accepts that it's a one way ticket to exterminatus.
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