Bike weight did really matter. But now the big (marketing) companies come up with aero framesets and discs, and suddely weight isn't important anymore...
Marketing!!! A big issue! For specialized the aero model weights about 350 grams more than the tarmac. It is really beautiful but I believe that it is really heavy because the complete bike in size 56 with pedals is about 8.4 kilos.
That's mean around 1 kg more than my cyclocross bike ( in size L )
In real life you won't feel half kilo difference. make a test; go with someone to ride and during take 1 bottle filled with water, then give it back after while , and again, and again.... DID YOU NOTICED ANY CHANGE ? Nope. It'snot gonna happened. 700 gram ... to lighten you bike by 700g you need 900-2000€...
Does bike weight matter ? yes, more for lighter guys than for heavier. Much more on long steady climbs than on mixed/flat terrain. But not even close to as much as insisted here. In real life in majority ( if not all ) here, difference between 6.8 and 7.5 kg is totally irrelevant. What you gain thru that "extra weight" is durability and reliability. If you plan to ride the bike, naturally
Beauty of the thing is in freedom. Anyone is free to use its money for anything, and that includes making bike as light as possible and not even rde it. Ever. But do not confuse this with performance of the bike. Many from "lightening updates" here has completely nothing to do with it.
Go to Heaven for the climate, Hell for the company.Mark Twain
I can be wrong, and have plenty of examples for that