trading features to do that isn't a wise method. besides that you are assuming that the display causes the lag. it isn't. Besides that, even if it DID, people are going to naturally put up a display the hard and ugly way anyway so the whole rational is silly not to just include it in a single block/ Digital Chests are inferior to Barrels because of this, as with the correct methods, barrels can also intake from any 'side'.
i don't really know what you mean with the first sentence, so i'll just start with the second. it is stated before that about 60 barrels take 5-8% of the rendering time. also i notice that when i walk into a room with alot of barrels(on the server i joined) i inmediatly get a drop in FPS, to the point i decided absolutly no barrels in my base. now to the point about knowing what is in the chests, you could use signs. i havn't heard anyone say bad stuff about those, so i f you have a fragile computer, this could be a life-saver.it also has some additional features, but you'll have to look for those yourself if you want to know. also, like with a lot of the stuff in minecraft, if you don't like it, don't use it. you are absolutly free to use the barrels, if you choose that.
i know i won't(don't get me wrong, the're nice, just no
, also, i'm not using the chests either, just gold/diamond for me
i just like Gregtech, wanted to point it out).