hello99: “MHY: reread the Igros Moshe, because you are the one distorting his words. In the continuation of the teshuva what he REALLY writes is that “perhaps” now that many have moved to EY from Europe it is now common for many to wear tefillin CHM in which case it would be muttar. However anyone who has ever been in EY for YT can tell you that despite the waves of immigration the past 60 years, it is still unheard of to see one wearing tefillin in shul CHM.”
Not exactly…..
Rav Moshe says that one is allowed to put on tefillin on chol hamoed in Eretz Yisroel. The word efsher in the teshuvoh is not connected to where he allows it, it appears only later on. Whoever is interested should look in the teshuvoh inside to see the exact lashon, ??? ???? ??????.
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Also, you are mixing two issues, one is wearing tefillin on chol hamoed in Eretz Yisroel bichlal and one is wearing them in Shul. Those two things are not exactly the same.