Is it safe to use AudioEngine + SimpleAudioEngine

I have seen a lot of improvement in cocos2d-x 3.15 AudioEngine, but there is still a bug when playing too much sound it will crash sometimes soon (all devices i tested so far, test play for about 10 minutes). I can just use SimpleAudioEngine to play effect, but i need AudioEngine function to play more than 1 BGM and other function like endListener.
Is it okay to use both of them in one project? i have tried it and nothing bad happen yet, but there is a warning in cocos2d-x 3.15 AppDelegate.cpp file to just use one, so what is the reason?

Yep, please just choose one of Audio implementation. AudioEngine or SimpleAudioEngine.
If you find bugs in AudioEngine of v3.15. Please submit an issue on github.
And tell us the detailed steps about how to reproduce it.
A reproduced demo will be better.
Thanks.