I think the primary reason is path dependence, back in 60s when US made the decision to go all solid fuelled it did so because they perceived solid fuelled missiles as being more reliable/easy to maintain.
By 70s/80s Soviets solved the reliability issues with new generation of weapons (ie R29 series).
Bulava is a solid fuel missile (made by the company that never desighned SLBMs btw), unless you count the bus.
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Grumpy as always.
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