Rabbi Joseph Soloveitchik did not believe it was muttar. To equate his shittos with Rabbi Lamm’s is committing a fallacy. Although his wife didn’t cover her hair, there are numerous anecdotes from his talmidim which suggest that although he disagreed with it, he didn’t see it as grounds for divorce. It has to be realized that it was a different time back then and the type of woman looking for a Ben Torah differed drastically from what we find nowadays
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