You are right about people enjoying the gameplay aspect of the SMN overall. But if you ask them about the aesthetics and/concept of the SMN, you'll get mixed results, mostly leaning into dislike. Its a sentiment I find people express a lot whenever the SMN discussion pops up. I've seen a lot of responses that pretty much share this vein "its a great job but it feels like it plays like X class. Look at our egis. Ifrit became the new Garuda. Titan still does not see light of day unless your leveling it and/or a situation arises that bringing it out is better than nothing. Eikons keep coming out in future patches but we still are stuck with our basic three. Our egi glamour consists of differently colored carbuncles. Very cute but not diverse.
The core components of the job are enjoyable, even moreso now in SB and a lot of people enjoy it. If it was labeled a different job, people would still enjoy it. However the same people who enjoy it also wish that the SMN job had more recognizable identity in its gameplay and thus why every now and then, you see a thread about "I wish SMN was more...SMN".
Again, I can't help but stress this: We don't hate how it plays. We just wish it had more SMN...factors. Maybe sometimes we go the wrong way about expressing how we want it but we don't actually hate the current job.