Well here we go. First of all the three items mentioned came out of the Apollo program either directly or indirectly. However, you will not acknowledge that, preferring some other version of history written to your personal liking.
Sure there were computers when before Apollo but they filled rooms even whole floors. Apollo forced the start of the miniaturization and search for more efficient materials.
You can like, some other curmudgeons on FR, insist that nothing came out of any government research or NASA (which until the end of Apollo it was). But the list of things is long and easy to find.
You can go on believing that all the laws of physics are now known and settled like global warming. But you are now and ever will be in that tiny minority of humanity that fears the unknown and hates the very idea of spending resources to conquer it, will stop at nothing to prevent any advancement anywhere in anything.
You need to understand that all we know of the entire electromagnetic spectrum comes from Oliver Heaviside’s rewriting four of Maxwell’s 200 field equations in the 19th century. The other 196 Heaviside declared as abomination and have remained obscure ever since. Those other equations describe ideas that are only seen in scifi novels, but any alien could have easily mastered - as could we, if it were not for extreme prejudice found in attitudes toward exploration as you seem to espouse.
So no it is not impossible - just more difficult to go from one star to the next or one galaxy to another - those are not unimaginable distances except for those lacking said imagination. But then you have made the pronouncement from your basement and we all bow to you infinite wisdom, far-nearsightedness, intimate knowledge of the laws of the universe, and in particular, the physics that operate here on Earth.
Sorry. But Einstein’s Theory of General Relativity, which has been proven experimentally, has demonstrated that the speed limit for anything with mass is the speed of light. In fact if any biological or mechanical entity even approached that incomprehensible speed, its density would be so great that it would never survive as designed. The distances to the nearest star is simply too great for anything mechanical or biological to reach us or them. However given that earth has been transmitting in analog for over one hundred years and digitally for over thirty, our presence in at least fragmented forms is reaching distant stars. Eventually an alien civilization which may in turn be linked to other alien civilizations via transmissions but not physical travel, may in fact communicate in some way. However the current NASA leadership will have potentially have more success in their new found mission of reaching out to Muslims, than establishing a resource draining base on the moon. Science fiction, while it may tickle the imagination that can be stimulated in other innumerable ways, is just that. Fiction. Perhaps you may wish to sit under an apple tree on a warm autumn day and see what thoughts come to you.