Can someone explain this in terms that are slightly more, let's say, basic? Like, does this mean React would be a good choice over other frameworks that can't

Can someone explain this in terms that are slightly more, let's say, basic? Like, does this mean React would be a good choice over other frameworks that can't do this, to reduce jankiness? I am relatively well versed in vanilla JS, but have never made the jump to a framework, as there are just too goddamn many and I never know whether I'm really gaining anything from using one -.-