First of all, thanks for your answer: it was very helpful to me.
I understand what you mean, but I do not completely agree with this point: select an application from the list of installed ones and tap “uninstall” button: this is not subjective, this is certainly easy 
Thank you very much. I was able to do all the steps.
Yes, this is very reasonable. Doubt remains about non-core applications, such as weather feature.
I do not disapprove of anything. I am always sincerely grateful for the work done by all free software developers. I asked the question to see if there are any reasons that aren’t entirely obvious at first glance. And for now I remain with my doubt
Are the default widgets hardcoded into the Bliss launcher? (I removed the weather app but the widget is still there …)
Thank you again.