Are there houses that even professional software cannot depict?

Professional software costs several thousand and is usually not found on YouTube or Google.

0_o. "Mathematica" cost over 3000 euros around 2010, and you can find various videos. And that is certainly even more specialized than "AutoCAD" with its many tutorials. Costs at least 255 per month, over 2000 euros per year, over 6000 euros for 3 years... AutoCAD can basically be "interesting" for many people including private individuals. Completely regardless of whether they buy it or pirate it. Designing 3D objects is more something for the masses and more practically usable (3D printers, animation...) than mathematics.

And what speaks against Sketchup?

This would make everything quite straightforward to implement from your plans and sections, including true dimensioning. There are also great tutorial videos here...

(In the end, you have to be able to handle the tool; with a certain complexity, the more difficult program can quickly be worthwhile if you otherwise need lots of workarounds.)

0_o. "Mathematica" cost over 3000 euros around 2010, and you can find various videos. And that is certainly even more specialized than "Autocad"

Mathematica is used massively by science students (cost something around 100 € for students around 2005), of course there are videos for it. It may be the same for the standard software in architecture.

There are also people who don’t care which version it is for a video. They also make a video with a pirated copy. As long as it is not visible in the video, the manufacturer can’t do anything. The person could have also made the video with a licensed version; the creator’s name does not have to be in their database for that. They wouldn’t get it from YouTube for something like that, and it could be from someone else. The "standard software," or the smallest and I believe one or two versions above, apparently cannot even do 3D, and there are enough videos for Architekt 3D that are clearly more than the "standard" version.

And what speaks against Sketchup?

With it, everything would be quite straightforward to implement based on your plans and sections, including real dimensioning. There are also great tutorial videos here...

(In the end, you have to get along with the tool; with a certain complexity, the more difficult program can quickly be worthwhile if you otherwise need a lot of workarounds.)

Although I am also a big Sketchup fan, the "installation" of windows, doors, etc. can be really tedious – but you are absolutely free in the design. Some "more specialized" software with parametric window, door, and stair models is definitely much more comfortable. Nevertheless, Sketchup is an equivalent tool and offers unexpected possibilities through flexibility.