Way back in the day my brand new RV4 tipped the FAA scales at 915 lbs. I took this as a victory until I thought, why do I need an electrical system, starter, battery etc for MY mission? Good question, so I removed all the above and yes, my unpainted, ND 0-320/Sterba HH radio no transponder Vans masterpiece weighed in at 889 lbs, a bantam weight fighter!
For me yes, ergonomically oriented, maybe not. But who cares, right, I built it per my own specifications right?
Well I did eventually compromise adding back lightweight electrical system components, ditching the Mags for EI and settling for 925lbs full up with paint.
So how did the " light flight " characteristics differ from the latter?
Not a huge noticeable change but the 889lb 4 was a delight, great aerobatics, 1v1's with my F16 Bros, amazing STOL etc.
However, even heavy RV4s are delightful...my 1100lb+ HR2 with 300HP was a case in point!!! Yeeha!