IPv6 ICMPv6 type 134 RA, what's the difference with broadcast ?

Hi guy's,

I'm learning about IPv6 and i learned that when host need infos they send RS to the FF02::2 all-router multicast address.

When the routers recieved that, they will answer by sending the data to the FF02::1 all-node multicast address.

I was wondering, why do the router use the FF02::1 adress and spam every host when he could use the SRC address of the host which is asking about infos ?

Correct me if i'm wrong but it looks like IPv4 broadcast ??

Thanks :)