Why are some Haswell AVX latencies advertised by Intel as 3x slower than Sandy Bridge?

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In the Intel intrinsics webapp, several operations seem to have worsened from Sandy Bridge to Haswell. For example, many insert operations like _mm256_insertf128_si256 show a cost table like the following:

   Performance
 Architecture   Latency   Throughput
 Haswell        3         -
 Ivy Bridge     1         - 
 Sandy Bridge   1         -

I found this difference puzzling. Is this difference because there are new instructions that replace these ones or something that compensates for it (which ones)? Does anyone know if Skylake changes this model further?

avx2 x86-64 simd intel cpu-architecture
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