Tool marks would be consistent across the work, would an archeologist deface an antiquity ? would stone age people take the time and great effort to mimic tool marks ? not just the finished stone but the quarry site as well ? and of course why would your helpful ETs wait the years it would take to free and dress the stone before working their fantastic technology to move it ?

Au contraire! The bulk of Mankind's technological progress has come about directly because of war.

Airplanes, for example. Heavier than air flight. From the time of their invention (arbitrarily, 1903) they were basically toys. They had little or no value other than that. Then WWI rolled around and all of a sudden the technology was making huge strides. WWI was only about four years long, but the flying machines available at the beginning were positively prehistoric in many ways compared to what was available at the end. Jet power too: the idea had been kicked around before WW 2 but not much came of it. At the end of the war both Great Britain and Germany were fielding jet fighters with ever-more powerful and reliable engines, forming the basis not just of the fighter jet complements of most countries today but of the entire civilian jet transportation fleet that exists today.

Going the moon and robot ships to other planets? Most of the technological basis for that, both ours and the USSRs, comes from German development and experimentation. I doubt we'd have sent Neil Armstrong to the moon had we not "imported" Werner von Braun and cronies after the end of WW 2 to work on our rocket program.

Many other things too: things that began because of the needs of war that later became civilian mainstays, such as;

Radar;
Atomic power;
The cavity magnetron;
progress in meteorology;
Computer science (existed before WW2 but made huge strides during the war years;
Canned foods (thank Napoleon for that one);
Medicine (blood tranfusions, skin grafts, surgical knowledge, etc. all made tremendous progress because of war);
Sonar;
Etc. Etc. Etc.

The list is literally endless. Odds are, had it NOT been for wars, the height of our "technology" might still be spears.

Yes, extraterrestrials built the pyramids. They were markers for their brethren to help chart the skies. They were on their way to more civilized worlds and Earth was a rest area on the way. Once they built the markers, they continued on and the humans inhabiting the planet at that time were let out of their ship-side cages, their amnesiac medicines worn off, and continued on with life without skipping a beat. They were hypnotized to assume they're the ones who built it, and never knew any better.

Fast forward to now, and we all know the secret truth. It was the aliens.

There. Now let's talk about that dryer lint please?

Good video on YT showing how copper saws used at the time just doesn't work cutting granite blocks. Advanced tech is the only way it could have been done.

Pyramid builders used softer stone but to some extent used pink granite, one of the harder ones, used a hammer stone to beat away the surrounding stone, talk about labor intensive, the quarries show the work.

1,000 t[22] Ramesseum Statue Thebes, Egypt Ancient Egypt Transported 170 miles (270 km) by ship from Aswan

You left out GPS. I'd be lost without it - literally.