Hi @alexarch and welcome to Gladys! 
We agree!
We have several threads on the forum where we’ve discussed possible improvements. 
For example, to improve the « Graphs » widget:
What you’re proposing is pretty close to another project we have in mind:
Add a button on that graph widget to open a dedicated screen, offering advanced analysis options: filtering by specific dates, CSV export, etc.
Gladys is an all-in-one, unified product. There is no extension system, and that’s intentional: the goal is to provide a coherent and optimized experience for all users.
Gladys’s philosophy is different from Home Assistant’s. The ambition is to have a turnkey product once installed, usable by the whole family, and not just by a « developer » audience.
If you want to contribute to improving Gladys, the best approach is to submit a pull request (PR). I’m very responsive to feedback and available to help you set up your development environment if needed!
An article to help you get started:
I’ve also done quite a bit of live coding on YouTube; it might give you some inspiration:
https://www.youtube.com/live/XhizKv8KNLQ?si=kLIIkCTwpuzeLlJo\u0026t=102
In any case, don’t hesitate if you have questions, and again welcome to the community 