Totally agree with all the points you describe, aesthetics is important , we should not subtract its potential.
Of course, we all know the enormous effort put under the trunk by those who are developing this product, like Martin and the rest of developers, but that perception is not so for new users. The first thing they look at is the surface and novelty aspects of the image. I know, it's a bit superficial but that's how things work.
Nowadays almost all IDEs use a dark environment, which besides being interesting for visual fatigue gives a modern look to the tools. It would be nice if the Lazarus IDE when installed would give the option to choose between a dark or light theme, as minimum options, something that already exists as an integration possibility.
As for the presentation image, it is good to renew and you can keep the original philosophy, respect the principles that are key, but it is good to update these things.
<Shrug>. Change for the sake of change. IMO, keep the current splash screen... it already contains version information.
It's not about information right? It's the very first thing anyone using Lazarus sees. It will shape the expectations of whatever comes afterwards. If it's ugly or looks old timey, people will go into using the IDE already considering it old or outdated.
If you want people to pick up Lazarus, make it look worth picking up.
Design is probably the single most important aspect for the decision of someone to use or not use something. It can have all the functionalities you could ever wish for, if it looks like straight out of an IBM commercial from the 80s, no one is going to pick it up. Simultaniously, you can have something with very bad and limited functionality, but if it looks inticing, people are going to give it a try.
It's why I think dark theme, docked mode, editor color schemes, etc. should be chosable in the very beginning. I've seen more than often enough when Lazarus pops up cleanly, undocked, with bright colors (or even worse on linux using the dark system style, but the editor having a bright theme), that people ask "what the hell this is" (literally the wors a friend of mine said when I finally got him to install Lazarus).