We had big hopes for Sketchup 2019. But it looks like all capable developers were replaces by marketers in Trimble. Everything went wrong sinсe Google gave the product away. Sad.
I`m considering to create a separate platform, investing there best usability methods from SU, but eliminating the technical flaws to allow further developing. On this issue, I am open to cooperation.
For now we a planning to release reworked A2Toolbox for last suitable Sketchup version: 2017(Pro and Make). Maybe, for one of 2019`s species(Depends of many factors). Follow the latest news.