I don't think the lack of content is an issue really, there's no point saying a perfect enigne will support anything, it may well do so but radically different car types don't just appear overnight, LFS seems to have gone more down the line of making a large amount of cars then worrying about the gaps later, hopefully nK won't go that way.
There are so many small details only relevant to race cars, some only to small single seaters, that LFS doesn't seem to simulate for example:
Gearboxes seem totally random - 1600/1800 cars will have 4/5 spd Hewland boxes with straight cut gears and integral racing clutch. Larger cars will have 6 speed sequential boxes.
Clutches - seemingly overlooked in both real life/sim racing can make a big difference - the smaller cars could have either road or race clutches fitted integrally to the gearbox, bigger cars would be on racing clutches.
Dry sumps.
Car construction - carbon tubs for the faster cars, tubular for the FF, makes a huge difference to stiffness (not even simulated in LFS). This is something that probably explains more than you think about why the LXs handle oddly and would suddenly stop all this bollocks that Minis are faster with the roof chopped off.
Collisons - I think Tristan commented that he feared there may not be any visual body damage far more important is the damage to wings/suspension/overlapping wheels single seaters never get away with the sort of contact seen on a regular basis in LFS races.
Gravel traps - hopefully it will finally be a sim where you can't get out of them.
Bending valves - this is particuarly relevant if the 1600 is a CVH, bending valves as a result of over revving is a real problem in these cars, easilly done by missing a gear and the H pattern cars are never changed by flatshifting.
Sensible tire compounds - seeing as they've worked with Avon hopefully we'll see sensible compounds that are acctually raced with rather than these super soft tires like the R1s (which are really more like hillclimbing tires).
Bedding the engine in - Hopefully this won't be simulated as it will take extra time but some very slight randomness in the condition of the engine could be good, real racing cars have good days and bad days and certainly can't be run at full pace from a fresh build as they seem to be in all sims atm.
There are so many small details only relevant to race cars, some only to small single seaters, that LFS doesn't seem to simulate for example:
Gearboxes seem totally random - 1600/1800 cars will have 4/5 spd Hewland boxes with straight cut gears and integral racing clutch. Larger cars will have 6 speed sequential boxes.
Clutches - seemingly overlooked in both real life/sim racing can make a big difference - the smaller cars could have either road or race clutches fitted integrally to the gearbox, bigger cars would be on racing clutches.
Dry sumps.
Car construction - carbon tubs for the faster cars, tubular for the FF, makes a huge difference to stiffness (not even simulated in LFS). This is something that probably explains more than you think about why the LXs handle oddly and would suddenly stop all this bollocks that Minis are faster with the roof chopped off.
Collisons - I think Tristan commented that he feared there may not be any visual body damage far more important is the damage to wings/suspension/overlapping wheels single seaters never get away with the sort of contact seen on a regular basis in LFS races.
Gravel traps - hopefully it will finally be a sim where you can't get out of them.
Bending valves - this is particuarly relevant if the 1600 is a CVH, bending valves as a result of over revving is a real problem in these cars, easilly done by missing a gear and the H pattern cars are never changed by flatshifting.
Sensible tire compounds - seeing as they've worked with Avon hopefully we'll see sensible compounds that are acctually raced with rather than these super soft tires like the R1s (which are really more like hillclimbing tires).
Bedding the engine in - Hopefully this won't be simulated as it will take extra time but some very slight randomness in the condition of the engine could be good, real racing cars have good days and bad days and certainly can't be run at full pace from a fresh build as they seem to be in all sims atm.
.
. It'll easily run Netkar, but, i really wanted to have a go as soon as it's released, and get as much practise in as poss, coz i dont fancy being a "tail end charlie" online 
