People shouldn’t shop around for different kulos. You should ask your Rav. If he wants to rely on others’ opinions, that’s up to him – and a lot may depend on the individual case.
Using the Eruv for example – I was told by a Rav who learned by R’ Tuvia Goldstein zt”l, that R’ Tuvia held you could make an Eruv in Brooklyn, and even held the existing Eruv was good. (Back then, it was a much smaller one, and was not accepted by almost everyone.)
However, R’ Tuvia wouldn’t issue that psak publicly, out of respect for R’ Moshe. He would tell people, however, that in certain circumstances, it could be used. For example, if someone had asthma and needed to carry an inhaler. According to R’ Moshe, such a person had to stay in their house on Shabbos, as they couldn’t carry it. According to R’ Tuvia, one could carry the inhaler in their pocket, since it wasn’t visible.
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