This is the same bullshyt "write and submit a patch" and "RTFM" mindset which pushes a lot of people away from F/OSS projects.
While many people have ideas not everyone is a do-er or a coder. Responses like yours discourage people from providing ideas.
I don't know what a-pex does to support the Amiga community, but I certainly wouldn't discount his missive simply because he's not coding.
To be fair, "make a new browser" isn't really that much of a valuable or even novel idea, and the tone of the original post was that of someone who expects a new browser project to pop into existence as soon as some obscure version mismatch between two horrible pieces of software on the horizon is pointed out. Ideas are a dime a dozen, and if you have one and are not a "do-er", that response at least prompts the OP to consider what kind of effort such a project entails.