None of that is dumbing down.
Star Trek always wanted to appeal to the masses. It's not highbrow entertainment. Its core is action/adventure with something to say.
Crew members split into A and B stories is a hallmark of Berman Trek. It's not "fractured stories".
DISCO has its action set pieces, so did all the other shows. They're a little more dynamic because that's what the new SFX tech allows. But the characters still do their monologs and problem solving like the other shows did.
Its more like star wars now. Thats what abrams stsrted and it continued with std. The phaser beam as we knew it is long gone. At least snw has brought back some of the classic star trek story telling. Yet it still wants to be more action like star wars or more edgy like the alien franchise. It just cant be star trek.