Planning to upgrade 7.11 to 8.4

Hi, I have been waiting for good time to upgrade. My simple questions are here

  1. Is Suite 8.4 is good and stable to upgrade?
  2. Is past customization related to UI, like adding buttons, and links on detailView are do-able now, as of Documentation is completed?
    Please answer someone.

I personally still wait.

7.14 looks stable finally with php 8

But ofc Im like you, in the project of upgrading to 8.x so I follow this thread !