The reason I am asking is not because I don't understand it - we use the addEventListener model a great deal in our own JavaScript code - but because I need to understand the relative priority. This year alone around 7 years or more of feature suggestions have already been filed on the suggestions platform. It's an absurd, totally inconceivable amount of work, and people keep suggesting yet more things in threads like this. How do we figure out what to work on? In part, by figuring out how bad the problem is.
Even if you had performance issues with your project, how do we know you're not literally the only person to ever have a performance issue with that particular feature? We can't afford to build features that only one person needs - there are far too many other features that could improve things for lots of users that would be better to work on. It could well be that the performance is fine for 98% of projects, and not fast enough for 2% of projects, in which case I'd probably say it's not something that should be prioritised. However if performance is only OK for 25% of projects and is poor for 75% of projects, I'd probably say it's a more important thing to look at.
The best way to make your case that it's the latter rather than the former is to make a project file that is reasonably designed and demonstrates a performance problem. That can make it clear that many projects may be affected. And then I have a real project I can try out - it may be possible to make tweaks to the engine that solve the performance problem with much less effort than building entire new features.
That approach can much more quickly arrive at a good understanding of the problem, or more quickly identify workarounds or other solutions that help. I'm afraid that writing long posts doesn't achieve that.
So I'd ask for your understanding and co-operation: I'm not refusing to understand, I want to better understand the actual problem in a meaningful way, and long forum threads like this do not generally help with that. I'm asking for the things I really need, and if nobody provides them, then probably nothing much will happen: we just have far, far, far, far too much other work that's already been proposed, and some of it already looks compelling, so that will take priority.