thats the point though, the only reason we have the Demi summons in the first place is to appease the crowd that were shouting "Summoner isn't a summoner unless its summons are big" I think the issue is that they are trying to tie two design fronts together - the reason we now have Egi Attack 1 and 2 is because the community moaned that Summoner didnt feel like a summoner because there was very little interaction with the pets and it was far better to just leave them on Sic. I think they moved the dots increasing Ruin to match the old style with fester - during SB there was a lot of complaints that the job penalised harshly, so they moved the fester = 0 damage when used with no dots to ruin and fester are buffed by dots instead.
As for the lore implications, if I recall, it isn't that we actually summon Bahamut, more just form his visage from the residual aether that remains after a DWT. Lore always comes after gameplay anyway - so I agree it doesn't really matter. But it is a convenient excuse they use now and then. I think the issue with Summoner now, is that individually its elements aren't overly bad. But when aligned together its a hodgepodge. That said, I don't think it requires any major changes to actually resolve. Small changes like increasing Energy drain cooldown to 60 secs but granting 4 charges instead of two, or allowing them and DWT to hold 2 charges would help. Rolling Demi Bahamut into DWT would also work, but I wonder whether we would end up with a lot of downtimes. The core issue for me isn't that the job is busy, though the new rotation has taken some getting used to, it's in how inflexible it is and that the damage output feels extremely low for its job difficulty. I do, however, like the flow from DWT to Bahamut to FBT - but I agree that a lot of things do not line up well and are difficult to keep in the flow due to their varying cooldown timers.
Actually thinking about it, maybe they tied the dots to ruin as another complaint in SB was that dots had little to no interaction with the other aspects of the job. At this point, I wonder if it wouldn't be beneficial to remove them entirely and role their damage into the egi or DWT. Not entirely convinced that would solve the job issues either though.