For someone just riding around and not racing, the lightness of a bike or the quality of the components will hardly matter at all.
Sure ... people want to convince themselves that by putting the money down for higher end groups like "LX" ... they will actually bike more effortless.
Bare in mind that placebo effect plays a huge ... if not omnipresent ... role in these matters.
Find the bike you like and the bike you will ride a lot ... all the rest is of no importance.
If you're not good at mechanics ... find a good mechanic too.