"... The current system works more than adequately and is indexable as well. ..."
And is subject to breakage & link rot if any of the link structure changes. This happened when the "comments" term was replaced by "item" a long way back. So all the links I collected failed until I checked them. For instance try:
Clean URI's are cool. They last a long time and just work ~ http://www.w3.org/Provider/Style/URI These URI's smell funny. Having said that it doesn't really effect the running of the site, indexing or searching and require coding changes. But it will bite you at some time in the future.
He wants people to take pride in their comments/submissions. Knowing your info is easily searchable by your handle influences you to create more valuable content.
The current system works more than adequately and is indexable as well.