Perhaps stuff also doesn't change as ofter as you perceive it -- I simply share more information than almost any other company for even small tweaks & tunes that I make.
You know the SA-12 has been out since 2009 and has been pretty consistent with only small tweaks made over the years.
The Z v.4 is going on 2 years with only small tweaks before the Rev.2 motor (which is still compatible with all current Z v.4s), the Z v.3 is going on 4 years, the SA-8 v.2 went over 3 years in production before I made the v.3 model, the SD-2 series ran for over 3 years (SD-3 is coming out), the E series v.1 went 2 years, the v.2 is on 1.5 years right now and still available, the X series went 2 full years before the v.2 revision, the E8 v.3 ran for 2 years before the v.4 came out, etc, etc.
I guess I don't get the whole "Sundown stuff changes every 2 weeks..." mentality when most products will go 2+ years before a version change... and some, like the SA-12s, have been around for over 5 years with only progressive tweaks.
I will say this -- YES -- if I see somewhere to improve a product in it's lifespan without making it incompatible with current models & also fitting within the budget for production I will do it right away. Like when we made XL leads standard on almost everything a year or so ago, like when I tweaked & tuned the surround and cone bodies a bit over the years on the SA series, so on, and so forth.
I also won't just sit on a great new idea for years before releasing it... if I think my new idea is that much better then I will make it and offer the superior product as a new version as soon as I can. So, I guess, you think I should just keep a good idea in my pocket for 10 years before releasing something new ?