Nothing wrong with having two drivers, and bringing the one best suited to the course you are playing that day. On your typical links course you probably want that run, though maybe if the course is really short and tight you'd rather the ball settle where it lands to reduce the changes of rolling into trouble. Or heck, if you're like me and can't think of 14 useful clubs to carry (I don't carry any fairway woods) carry two drivers. I can only wish I had one that would roll 30 yards, I've never had any but the no-roll type even when I had a 6.5* driver in the 90s... I've only been carrying two because I haven't had one I really like for about 5 or 6 years, but I think I finally found a keeper, though I'm not sure what I'd put in place of the second driver other than a fairway wood or hybrid I'll never use.
When Johnny Miller won The Open at Birkdale he apparently carried 2 drivers, one for distance and another for accuracy. I'm not sure of the exact club specs but I guess they were different lengths and had different lofts.
Apologies for going Golfwrx-like here but I experimented with two modern titanium/graphite shafted drivers for a while a year or so ago. One had a standard length shaft and lower loft for tee shots when distance was needed and appropriate and the second had a shaft cut-down a bit and more loft for tee shot accuracy and use from the fairway as well. The second one I tweaked to ensure it still had reasonable swingweight. What I found was that I wasn't hitting the ball much further with the longer club than the shorter one and that the shorter one wasn't much more accurate than the longer shafted one, so now I carry just one driver again.
Good points mentioned about flight and roll above. How things have changed with modern clubs (and balls). I still occasionally use my old steel shafted persimmon driver and the ball flight compared to a modern 460cc titanium/graphite driver is sooo much lower and the persimmon one provides very significantly more roll. I also find this when I play with hickories. Unfortunately the older clubs don't seem to hit the ball as straight, but that's part of the enjoyment and interest in playing them.
The club which gives me most roll though is a Ping Eye 1-iron that I've had for nearly 30 years which flies quail high when required and rolls for ever. I bought another one from Ebay for my big, strong teenage son and he's been amazed with the flight and distance it provides. A great links club...back in the pre-hybrid club days most pro's and many amateurs seemed to carry one as their go-to tee shot club and there were some great exponants of the club, Jack Nicklaus with his MacGregor blade and especially Sandy Lyle with his Ping come to mind. Not just the introduction of hybrid clubs but the also the introduction of the modern less-spinny, straighter flying ball had a lot to with killing off the use of 1-irons I reckon. Shame in many (if not all) ways.
Atb