Yes, you don't need solano, but at the same time you don't have time to level her up to actually TRY using her. Not to mention if things remain back-to-back as they are (I'm looking into the longer-term), you won't get to really aff up yurina, charlotte AND solano because awakenings next and you gotta try and get some awakened units up.
By using the SCs you're mentioning, you're effectively also saying that "Cutting short at -4 CR rather than -5 for example would give you a good day, maybe even two of farming." is not gonna happen, so just WHEN are you going to farm affection items? At that rate, even for older players, they're probably only going to manage to full aff like 2 girls every star event. so, are you saying that the others girls you maybe get from premium summons don't need affection considering that a star event comes like once every 3 or 4 events or so?

Look, we're not saying to have some crazy longass break for newbies to build team; we're just looking for a 1 week break after every event to be able to work up whatever additional members we got (either event or premium summon). Hell, even a week-long break every 2-3 events is better than none, although increased drop rate would really help to balance things out if that's the case. It is not likely anyone would spam premium summons forever if they realize they can't even get their spotlight units up and ready for events and new content. A week break is not going to kill the older players, honestly, and it gives them some time to restock on provisions.

point being: nobody wants extremes, a balanced approach is often the best approach. Yeah you can say back-to-back is fine for now since there's star rush for breaks, but don't forget that nutaku doesn't necessarily follow the event order from DMM. the next thing you know, they might come up with 6 back-to-back completion/unit farm events, and then you can enjoy getting event units without the chance to use them. which then makes you wonder the purpose of event getting event units at all. and then if there's no purpose in getting event units, the new content becomes relatively pointless and nothing more than just repeatedly grinding events for the sake of grinding them like in PPS.