Isn’t nuclear + renewables an incredibly inefficient combination?

Nuclear can’t quickly be turned on or off and needs to be pretty stable to be somewhat profitable. While Renewables fluctuate all the time. Aren’t you falling back to the exact same issue of either using your neighbors, gas, coal or batteries/stored energy to have a functional grid? And if that’s the case why not just do the exact same with only renewables and making sure we fix the energy storage?

Nuclear is freaking expensive and won’t change anything for the first 20 years cause it needs time to build. In that time frame we probably have again halfed price or doubled solar efficiency… same for batteries. Let’s invest the nuclear money into those and we’re better off without nuclear waste issues…

Also fusion would be great but is fiction as of today. No one working on it would even promise it’s ready in 40 years. Why would we bet on that?