So what's wrong with Summoner?

[SpeckledBurd]

I don’t play SMN nearly enough to comment on playstyle, but I will say that I have no complaints about busy jobs. Honestly, I haven’t heard many complaints about current SMN outside of it dealing way too much personal damage for a job that also has utility (see arguments about selfish DPS versus utility DPS). I would never advocate for jobs to be dumbed down—I’ve always advocated for the opposite (like when they removed BRD’s complexity in ShB). I was just addressing the OP’s comment about SMN being “a mess” and what the comments I’ve seen about it being “a mess” have generally been directed towards. But, as I said, I don’t read in-depth, SMN-specific job design posts often. I tend to stick to posts about balance within the DPS role.

It's possible that the OP saw some threads detailing complaints before 5.1, where the consensus was that Summoner was a mess.