I hope you don't carry only one club when you play golf. :lol:
There's no such thing as a "perfect" newsreader - they all have their strengths and weaknesss, as well as performing a different set of functions. Some are better for reading/replying to text posts, others make good thumbnail picture viewers, while others specialize in streaming video. Some are "portable" and can be run off a flash drive - while many are not. Some are easy to learn and some highly complicated. No single newsreader even comes close to doing it all.
Even among some of today's "standard" features on binary news downloaders, consider some of the various features that have appeared over the last few years:
Yenc support
SSL encryption
auto-rar
auto-par
NZB downloading
NZB creation
header grouping^1
header grouping^2
header compression
multi-server
fill-server
proxy settings
RSS
bandwidth throttle
scheduler
These feature were introduced one-at-a-time, and most debuted on different newsreaders or add-ons (for example, Stunnel). Historically, the only way to get all the latest advanced features was to have multiple clients installed, and the same is true today. If you don't want to wait months for the latest-and-greatest feature to appear on
your favorite client, the only option is to install another newsreader that offers it.
Also, most newsreaders only work on Windows (and most Mac newsreaders and many Linux ones don't). People like myself who don't limit themselves to a single OS will usually have a different set of applications for each OS.
I also happen to like trying out new software. So many people ask "what's the best ..." but I prefer to see for myself exactly what each one is capable of. I might have tried out a hundred different newsreaders in all -- I've completely lost count.