Guess you can't please everyone. I thought when I last wrote Rippled Dimensions the plot was fine enough. And even when I haven't specifically mentioned it, I did set it that every chapter will focus on different Riders; regardless of the worlds or time period. The order of chapters corresponds to the RIDER in focus, not the worlds! Or time period. Thus the order of the chaptering (except for the last three chapters) follows the order of appearance of the first nine Heisei series backwards. (Decade > Kiva > Den-O > Kabuto > Hibiki > Blade > 555 > Ryuki > Agito > Kuuga)( Don't read unless you've read the whole set because it's confusing regardless. And probably spoilers for the fic in question, depending on how you'd interpret it. )
TLDR, you're reading someone else's writing. Perhaps some plot device are there for a reason. Unless there's obvious grammatical or spelling mistake, don't demand that the author change the fic to suit your preference. Because yes, the way you said it... and seeing that I used to write in that 24 kinda story-telling aka telling different stories in one continuous timeflow, I could combine the two chapters but I'll assure you, the chapters would end up terribly VERY confusing. In the similar way you would grow bonkers trying to see the events of Doctor Who on one linear flow of time especially when different Doctors are involved. I prefer to do away with that.
And unless it's to fix minor grammar/typos I usually do not want to change any of my fics drastically unless they were seriously out of character because half the time, I'd probably won't finish the changes. Especially for COMPLETED stories.
And I don't see other people getting worked out about this part before.
A/N: Because someone in FF said that I should change the Den-O/Kiva chapter into ONE chapter just because Kiva-Den-O world are set in the same universe. -__-;;