No, go on, bore me! ... What particular game manipulation are you trying to stop ? I would like to hear the rationale behind why Innogames would want to do something that deliberately antagonises their own players. The only manipulation I can see is gaining extra space for rearranging our towns and you have already provided for this type of manipulation by introducing the Teleport spell.
The Fellowship Adventures and some Events force us into a game style where we use all available space to construct Level 1 Workshops and Manufactories. At the end of these we then have to delete all of those buildings and occasionally there are "casualties". In my case. for the last FA that was more than 50 buildings, where you fall into a pattern and don't necessarily check as thoroughly as you should. In the process, yes, I did manage to accidentally delete a Level 31 Workshop that was hiding a Level 1 Workshop, and the "are you sure" prompt looks the same for both! Why not let me reinstate it? More than a month of effort and countless time spells later, I've got it back.
If you are worried about manipulation, how about a "recycle box" that is controlled by you guys, the moderators? It could have a 2 day expiry time, so that people don't come back "years later", which I agree is unreasonable. With your all-seeing powers and obvious game knowledge, you could see whether the deletion was a legitimate error or a deliberate game manipulation and not reinstate the building. I agree that not all buildings should be available but any normal building over Level 20 and Ancient Wonders over Level 5 where you have to use runes to upgrade them should be considered.
You have already admitted that you have the ability to reinstate buildings, despite what I was told when I accidentally deleted my Level 11 Mountain Halls 2 years ago. Incidentally, I have only just got that back to where it was and it almost led to me quitting the game. It was only one my my Fellowship members that talked me into continuing.
At the end of the day, I will only spend money in this game if I enjoy playing it. At times, playing the game is a time-wasting chore, and if I decide not to play it, then it is Inno that loses out, not me.