I stand somewhere in between. Of course the game should abstain from the original P&P rules where it makes sense due to principal differences between P&P and a computer game. For instance, removing randomized HP gain rolls on levelups (or attribute rolls in char creation - although that would bring some nostalgic memories to a BG1/2 veteran like me) makes perfect sense (and generally anything with the potential to reduce the appeal of save game scumming, like the dialogue checks - but that is obviously not going to happen). Using the statistical expected value instead of a dice roll principally shouldn't alter the balance much (if at all). But there are also many cases where anyone knowing the actual 5e rules wonders "but... why?"