Is detailed planning for a single-family house recommended?

Guys, this is an ad ;)

This work is only performed by an architect authorized to submit building applications, not by an MEP planner.

I assumed the OP had already understood this - that the MEP planner is only additional (if at all) and not a substitute for an architect. The combination "Windows floor plan self-drawing program plus MEP planner" would of course be nonsense.

People, this is advertising ;)

You mean a promotion fake?

You mean a fake promotion?

Look at the other sentences: these are not sentences that an owner of a newly purchased plot would say.
The meaning also does not explain that an electrician advises xy...
You don’t just come to YouTube when looking for an architect, at least a YouTube channel is not worth mentioning for a forum participant, but the matter itself... (here: TGA)

I'm not that familiar with YT channels, but apparently you also need followers and likers to earn a few cents.

But it's okay, no link was set, and a thread about TGA once... why not ;)

I just went on YouTube now: the story about the car purchase has the same mistakes as the opening post -> my opinion: that's not how you do it, neither with a car purchase nor with building a house.

I am very annoyed in hindsight for having forgone this TGA engineer, the 34 thousand euros would have been possible to spare. Now the cat has to live with a basket without LEDs, and she would have loved to have mouse-gray light, she tells me so. And my wife, how much she misses that no light goes on when opening the shoe cabinet. And the networking of TV, refrigerator, blender we will miss during the World Cup, every goal automatically mixed a vodka O juice, that should be possible with good TGA planning... oh, oh, how could we have only saved on that! Take us as a cautionary example. Karsten

And the networking of TV, fridge, blender will be missed at the World Cup, every goal a vodka O juice mixed automatically

You have to be careful, a Brazil game really takes a toll on the liver then

That's what Samba looks like on the coffee table....