How is that an artificial limitation? The bus is a very tangible and real limitation for any CPU, boo-hoo.
There are no 68000 instructions that are only one byte long. They are all a multiple of 2 bytes.
So a byte wide bus means you need to use at least 2 extra cycles per instruction on a 68008 compared to a 68000. If it makes your machine easier to construct then by all means go for it, but it is like tieing one hand on your back.
