It took me 6 months to find the right distribution because there are many options to choose from. I don't think that choice is a bad thing at all. In fact, I think that it speaks volumes to the the kernel's flexibility of implementation. What is truly a downside, is the large amount of stuff that comes along with the kernel, making it well over 100mg at this point.
I think that comment regarding the size of the kernel is a bit of an overgeneralisation. Im not sure where you get your figures - it might be useful to back that up!
(Im running raring ringtail and my kernel is 5.2mb [stock])
I also assume you are not referring to the size of the kernel source (which would contain support for a tonne of hardware , GPU , CPU / Architecture - this naturally wouldnt be included in a compiled kernel)
By and large most common distributions may well have kernels that could be considered larger than needs be - the reason behind this as distribution packagers often compile a kernel that includes a broad range of support for hardware. Some of this may be modules that are loaded at runtime and some maybe compiled into the kernel.
In the case of a fixed platform like the amiga a linux kernel compiled only to support known hardware configuration im sure would be pretty f**n tiny.
I just thought i would provide the bigger picture.
N.