I didn't have a problem with the scene itself but it felt out of place, like it should have happened sooner. I didn't really have an issue with anyone else being in the room apart from Kali (no reason for her to be there at all, she could have excused herself), Murray (he's been used far more sparingly this season so he's not as annoying as he was in 4 but how well could he possibly know Will? Get out of there), and Robin's girlfriend (she's cool but it's not like she had to have known Will much at all before that day). Steve seems like he's the least close with Will among all the kids but I'll give him a pass since he's hung out in their circle long enough. Nancy's been around Will long enough via Mike to be there, plus he's been living at her house for the last year. Robin absolutely makes sense to be there since, like Steve, she's hung out in their group and she encouraged Will to be himself in the first place this season. I'm just glad the whole room didn't join in on the group hug at the end of the scene.
But to be honest, I was way more invested in Max waking up and Lucas being there at the beginning of the episode. Noah Schnapp just isn't on the same acting level as Sadie Sink and Caleb McLaughlin.