So, i've done a full reread of the entire series, Citrus and Citrus+, since yesterday and it gave me some thoughts.
Like how it's a really nice touch that the end of Citrus Vol.10 and the end of Citrus+ Vol.1 are the same scene and C+ expands on the circumstances of it a bit. And so bc the C+vol.1 scene doesn't copy everything from the Cvol.10 one it's easy to forget that that was the first time Mei has ever told Yuzu that she loves her to her face and that they shared a very romantic kiss there.
A great way to connect the end of the previous and the start of the new series~
Reading it all consecutively like this also made me realize that Mei hasn't "regressed" at all. She's more open with her feelings, receptive and reciprocative with affection from and towards Yuzu, acted more emotionally supportive and has been an overall maiden in love the most she's ever been in the series.
Every volume has scenes of them being lovey-dovey, emotionally supportive of each other or making out. Or all three. Even in terms of steaminess it's not like 'nothing' ever happens, heck, the aftermath of the summer festival has the hottest shot between them in this whole series so far.
Especially if you consider the timeframe. Volume 1 to 5 all take place in a bit over 4 months, there has been a considerable amount of closeness and growth between them in that short amount of time. Really the only thing that's missing compared to the previous series is all the pained expressions and lashing out, especially from Mei. It's easy to disregard her bc she's has a naturally expressionless resting face but she's looking softer and crushingly blushing more than ever before.
It was hard not to feel like nothing was progressing with the slow release pace the series has, especially lately, but now that i've read it all over again I can confidently say that I disagree with all the critique that Mei hasn't changed at all or that she's "as robot-like as ever". Couldn't be further from the truth imo.