Hey
doobgoob - we do add our fruit in primary, and we use a ton of it (literally! over a metric ton of fruit goes into every 13 hL batch). There are many benefits: added nutrient, pH buffering compounds, more evolved/integrated flavor and aroma with the honey, happier yeast, shorter aging times, etc. One of the drawbacks is that you need to use more fruit per pound in primary than you would in secondary, due to the fact that the vigor of fermentation can scrub some of the flavor and aroma - but this happens with the honey flavor/aroma, also. It definitely isn't easier, since you're dealing with massive poundage of fruit.
Also, it is worth mentioning that for us commercial folks (by some interpretations of the CFRs regulating honey wine, other than standard agricultural wine) it would be illegal to add fruit to "secondary" since you would be adding sugar post-fermentation (and we add no sulfites or sorbates to stop fermentation, instead relying on the ethanol concentration). Additionally, blending of agricultural wines from different agricultural products post-fermentation is also illegal (we co-ferment all of our meads with all the fruits in primary). There is no end to the madness of the federal regulations regarding mead.
CFR 24.203 and others regarding "honey wine" are a depressing read...