I just read this article: https://www.halachipedia.com/index.php?title=Introduction_to_the_Modern_Eruv https://www.halachipedia.com/index.php?title=Introduction

I just read this article: https://www.halachipedia.com/index.php?title=Introduction_to_the_Modern_Eruv https://www.halachipedia.com/index.php?title=Introduction_to... Bonkers if you ask me. There are three biblical areas > ...reshut ha-yahid (a private domain) and reshut ha-rabbim (a public domain). Any other area is considered a makom patur (an exempt area) Then Rabbis made up a fourth: > To avoid inadvertent violations of Shabbat, however, the rabbis introduced a fourth type of domain called a karmelit. This category includes some areas that would be considered a reshut ha-yahid on a biblical level and some areas that would be considered a makom patur on a biblical level. Which ends up with some oddities that seem to conflict with biblical dictate... > while an open field is a biblical makom patur [an exempt area], on a rabbinic level it is a karmelit [treated like public domain]. Then the whole discourse degenerates into this... > Rabbi Yosef Teomim, author of an important commentary on the Shulhan Arukh called the Pri Megadim, raised the possibility that the tzurat ha-petah is only effective in enclosing an area according to rabbinic law. According to biblical law, however, the tzurat ha-petah is ineffective. Subsequently, using a tzurat ha-petah to enclose an area that is considered to be a “public domain” on a biblical level would simply be an insufficient means to convert it into a “private domain.” A karmelit, however, is considered a makom patur on a biblical level and is only considered “public” by the rabbis; thus by erecting a rabbinically sanctioned enclosure, one successfully converts it into a “private domain.”[4] Every input here just leads to more questions, ultimately I think little of it would make actual sense to me even I studied a lifetime's worth of doctrine. To avoid a rabbit hole conversation I bow out and just chalk this up to humans being humans. Others are obviously free to think whatever they like, I have no problem with that.