Two trains of thought...
1.) H-D would put in "poor quality" parts as stock to get product out the door...even with a multi-million dollar facility and 100's of hours of design engineering put into a high dollar, long history and reputation of a well received motorcycle..."! or
2.) H-D would put in "low performance" parts as stock in the hopes that owners who just purchased the bike with great looks and performance and immediately go and start replacing those inferior parts..."! Answer...
Both are wrong...H-D puts in pretty high quality parts and materials into the bikes, and yes those original shocks have been in there for over 10 years...they may be tired, but you could probably get replacements and be fine, or find takeoffs as the rear shocks are often changed out if the other rider/owner is lowering the bike as an example or changing because majority of riding is 2-UP 325 lbs not a solo 190 lbs. Try Craigslist or E-bay...couldn't hurt if price is the driver here...