I too am a long time owner of of FLStudio. However, I have noticed that many new features added to FLStudio are not added to the base program, but rather sold as an add-on.
Perhaps the free lifetime updates plan is the reason for this.
It's slow to load, and you'll get lag when you move around a bit, and this is due to slow shader compilation, which I wasn't able to avoid with stock Godot 3.5. You can't easily multithread your WebGL application (at least not without a bunch of caveats), so the audio glitches as well. Additionally, streaming a lot of content while providing a good user experience is an extra design and technical challenge compared to downloading a native app.
Every shipping game is a miracle - by doing WebGL instead of native, you are adding a bunch of additional challenges. And for what? Players are just as happy to download a native build.
Depends on what you mean by "real time". My method of crawling the stack impacts execution speed of the app you are tracing. I intended to do future work to minimize that impact.
With allocscope, you do get a callstack for the allocations which leak, though.