There was no reason for them to rush Volume 5. There's no rule that says "Get everything done in a week" at least, we the fans didn't set that rule. If you need more time to do everything right, take more time to do everything right, for the love of god take more time. People will complain, people always complain, but if the end result is better it's worth it. Better to have people complain about waiting an extra week or two then have them complaining that the whole show has gone downhill.
One of the big problems with Volume 5 was pacing. We had Three Volumes to build up to the fall of Beacon, three volumes to put everything into context. What if in Volume 5 they had the girls go off on a side adventure in Haven that tied into Leo having the others killed and did some world building for Haven.
They could have taken us through the Lower Levels which are supposed to be a famous den of crime and black market activity, they mentioned in in WoR, how cool would it have been to explore that? They could have maybe slipped another good fight with Tyrian in to show Yang Weiss and Ruby working together as a team again.
Volume 5 could have had all that missing plot development and world building it was lacking and it could have ended with Blake rallying the Faunus in front of the ships to Haven. That would have caused Volume 5 to end on a high note with everyone excited, the reactions of the Fandom would be "OMG This! Is! Happening!"
Then Volume 6 could have been the finale, tying everything together. Like, what if instead of Blake just showing up with an army of Faunus out of nowhere, she was in Haven leading them in a campaign to take back the White Fang, we could have followed that in a few episodes before the final showdown at Haven.
Blake could learn about what's happening with the relics and maybe be forced to make a choice between ending Adam once and for all or focusing on helping her friends with the Relic. Whichever choice she'd make, it'd be an important piece of character development, and wouldn't have contradicted volumes of build up about Adam's significance as a threat.
Team JNPR could have gone on a mission to secure evidence about the missing huntsman and uncovered to their shock and horror that Leo was behind it, BEFORE arriving at the academy. When they finally arrived they could focus on each individual fight scene more, instead of rushing everything while making characters stand around uselessly and cutting away from everything...
Everything at the Shrine part was pretty much fine, same Cinder Fall ending, Yang gets the McGuffin, but everything else could have played out and been fleshed out so much better.
See what I mean? Things could have been so much better if they just had better pacing and didn't try to rush the McGuffin and wrap everything about Haven up in a single Volume.
The One Ring isn't what Lord of the Rings is actually about, if destroying the ring were all that mattered they could have just flown over a volcano with an eagle. A McGuffin is a Plot Device to propel characters forward on their own journey, it could be The Last Oreo it makes no difference, what's important is everything else.