@cloolalang if you haven't seen it already, https://forum.mysensors.org/topic/8813/any-success-story-on-lora-rfm95-module-and-mysensors/ might have some good information.
Edit: sorry, I see now that you already linked to that thread. Feel free to ignore this post.
@NeverDie I can give my thoughts here, and we can move it later to another thread if necessary.
The bigger selling points, at least for me:
Every project is a self contained directory, even the boards configuration, bootloaders, libraries, code and build procedure
I have a project template for mysensors (mainly a platform.ini) that I copy for each node that I create.
I can manage everything with my known tools (vim, make, git, etc)
I like to play with arduino and electronics, but have other interests (Family, friends and 3 small kids...) so I usually have little time to spent in my hobbies. Platformio allows me to just have all the configuration in code and know 6 months ahead that I can do a "make clean && make upload" for a particular node without issues, even if I lost my PC, as everything is in my gitlab account.
Also the FW of my 3dprinter must be complied and uploaded with platformio (marlin 2.0) so I can have only one tool for both hobbies.