again, as per my understanding of rabbi felders shiur on porch minyanim, a modern day psak often is a decision when to rely on das yachid. the need for tfilla btzibur didnt create the halachik standing a porch minyan relys on. that was decided many years ago by the pri megadim and others(if my memory serves me correctly). that decision was outnumbered by many gedolay achronim and is what is called the das yachid and therefore not relied upon lechatchila to avoid making brachos levatala according to those shitos.
however the mishna brura writes that in a shas hadchak perhaps one may rely on the pri megadim and
today in deciding which poskim to rely on in that shayla, our poskim invoked the motivation of shas hadchak gadol and paskin that since its really important to have tfilla btzibbur, one should rely on the pri megadim(and others) and make a minyan even tho it will go against the gedolay poskim that held its not a minyan and enters shaylos of brachos levatala.
the halachik basis is the pri megadim. the motivation to rely on the pri megagdim is the shas hadchak gadol, which is a need for the koach of a tzibbur.
hope this clarifies ur problem and answers why no on is “Creating minyanim solely for the purpose of having the koach of tefillah b’tzibbur.”
again if ur actually interested in fully understanding and im not doing a good enough job explaining, listen to the beginning of the first shiur.
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