Well the thing is that him showing up repeatedly, if it happens too much, is going to lower the impact of his appearances. Take Puss in Boots: The Last Wish for example. Death ended up being the most popular character from it by a MILE even though he had, what, 8 minutes of screen time? If he showed up in even close to half of the movies screen time, it arguably could have dulled the importance and impact of his appearances later in the movie. The reason he was so loved was how randomly he showed up. The movie would give you just enough time to forget about him, just for him to reappear when you least expect it, leading up to the iconic "I'm Death. Straight. Up." scene and the concluding fight. If Death showed up every other part of the movie before those scenes, they would have been far less impactful. That doesn't mean he wouldn't have been an amazing character and so loved, just that he wouldn't have been as good. Same thing applies to Blast. His appearances are still hype af and he has a lot of impact when he does show up, but it's been dulled a bit.
Compare the hype of his appearance in the last chapter to when he showed up in God's dimension with Saitama, FF, and Manako, or even the "reveal" of his team, or EVEN when he fought Garou. The difference in hype is utterly incomparable. When he left after his first appearance in the God dimension, that would have been PLENTY before his reappearance here. Instead, ONE had him show up again, reference his team, fight Garou, and actually have a few teammates come help him redirect the Serious Punch Squared energy. A lot of the mystique around Blast is gone, the theories are mostly pretty much dead, and we've even seen him fighting semi-seriously, so we have a vague idea of what he can do. Blast isn't very intriguing anymore and he's just kind of cool. The reason why he's still so hype now is just because he's sort of the gateway into that storyline. He's gonna be the plot device that lets us view the story line of the "Space-Time War Against God" or whatever. Most of the hype around him is gone and people are more interested in what his character is related to than Blast, himself. To have all of that happen in the span of like, a fraction of an arc feels pretty rushed to me considering that the God story line is the BIG thing.
I think the webcomic is going to get to the God story line but ONE will reference it and give us the story in droplets rather than dropping it on us like this. The appearances of God and hints of Blast in the WC were what kept the hype and mystique around the entire story line so alive and thriving in the fanbase. It has gone from "OMG THAT JUST HAPPENED HOLY SHIT WHAT'S GOING ON!?!?!" to "Oh wow there's Blast again!".
Overall, I just think a lot of the hype (not all of it) has been killed, and I think that was a mistake.
