Toilet window in the guest WC next to the entrance door - is it now a no-go?

Greetings!
I'm writing this here because it's somehow a floor plan matter.
Since a graduate engineer in civil engineering from my circle of acquaintances said a few months ago that all toilet windows next to entrance doors should be bricked up, I have been looking at the floor plans in this forum more closely according to this statement.
Quite, quite a lot of people plan the toilet window next to the entrance door. So is this just a single opinion of a pedant?
How do you see it?

By the way, the term "guest toilet" seems strange to me if the family uses it daily and occasionally guests do as well. I only learned this term here in the forum.

Since a civil engineering graduate from my circle of acquaintances said a few months ago that all toilet windows next to entrance doors should be bricked up

And why should they be bricked up? A guest toilet usually fits well there.

What are the better alternatives?

The guest WC next to the entrance almost automatically follows. Likewise, a window perpendicular to the door is more appropriate. And, by the way, there is a certain symmetry in the exterior view, which helps in planning the upper floor.

I understand what the objection is supposed to mean. If one were to design a house around an optimal guest WC, it would certainly be located elsewhere. But, in the priority list between living room, kitchen, stairs, and possibly an office/guest room, the WC usually ranks quite low and consequently has to be inserted where there is still space in the end.

I see it like Fuchur and don't recognize the problem, frosted glass windows or something and that's that.

That is probably mostly for practical reasons and maybe it's just part of the German architectural style. Have you ever noticed that kitchen windows have been planned for many years, even decades, always facing the street, house entrance, or courtyard? That way you can always see who is coming. Just take a look around

I still see it that way to this day. The kitchen window belongs facing forward.