Actually... I get Thomas Astruc's writing logic on timelines.
In terms of producing a TV show that may or may not go on for quite a while, I can see how locking down certain calander dates or ages might pose a problem in cases of season fluidity as various outlets get... creative with which episode goes where.
This is likely the M.O. of most other shows Mr. Astruc and his contemporaries have worked under over the last few decades with the likes of Totally Spies, Code Lyoko, A.T.O.M. and the like. Something lost with the rise of streaming services where stories are streamlined often to a fault and with fewer episodes per season. Miraculous practically carrying this torch likely clashed with certain expectations of certain viewers.
While there's a variety of plotlines and character arcs going on, timelines are vague enough to let writers have a bit of freedom in terms of what they wanna tell on an episode by episode basis. Like one thing I appreciated about Season 5 having a very consistent plotline, I could revisit certain episodes on their own as I pleased with their format in mind.
Obviously this isn't without drawbacks but though I criticize, I also see what they're going for based on my experience. Whether this is them being Boomers about writing for TV or not, I feel there's more to it than just "Astruc's being a meanie bo beanie to the innocent fans."
Though... I do wish certain season based episodes like with Winter or Summer were considered more. If only for some fluff and snow based superheroics.
