Well, lack of RAM is one of the major reasons why we lack a modern featured web browser for AmigaOS3 - modern browsers need more RAM, web pages today are resource hungry, number of open tabs alone is meaningless, try doing some work in them too! Working with gfx requires RAM too - I have done my share of animation on Amiga and know very well how limiting 128MB or even 256MB of RAM can be, and ditto if you do audio work, paging to disk is very annoying and also requires MMU features in the softcore to work - much easier to just have more *real* RAM.
There is always some specialist use case that can benefit from more RAM. I do data processing work that requires RAM in the tens and twenties of gigabytes. I browse the web with many tabs open. The question is, then, is the additional RAM worth more than the additional cost in development time, component price and board design? Is there software that will significantly benefit from it (Total Chaos and other specialist cases aside)? Would the relatively slow CPU, although fast in the 68k Amiga world, be sufficient for a modern featured web browser? Is being able to work actively in 50 tabs important enough to enough people to warrant the additional complexity?
The web browser problem is such a horribly ill-defined one as well. Tab usage seems to scale with RAM availability, and you can always make the argument that you *need* more RAM to support the weird habits you have acquired by being spoiled by a more modern, relevant and powerful architecture. Web page complexity tendencies also scale with ubiquitous RAM and CPU availability, and a lot of websites seem to operate on the assumption that I can dedicate a lot of my CPU time to rendering their Javascript animations. Animated GIFs? Outdated technology that, instead of benefitting from hi-color graphics and modern encoding technology, encodes 8-bit frames with run length compression, which with the dithering required to make most of them look somewhat acceptable, turns into huge files.
The basis of this sad development is the assumption of increasingly ubiquitous computing power, which happens at a much faster rate than the development of the 68k Amiga, and the Amiga will never catch up. The fact remains that you don't need 2 GB of RAM to surf the web.