Perhaps we should clarify what we mean by 1987 rules. Because I think when people say 1987 rules what they really mean is, like, 1996 rules. I think the biggest issue for Steph would be the way that double dribbles/carrying were called; that's slowly evolved over the course of the game. But the way defense was played in the 1980s would not have been a real problem for Steph, except maybe against the Pistons. For some reason (I think mainly because of the Bad Boys) people remember 1980s basketball as really physical and grinding, with constant hand-checking. It really wasn't - in fact it was a free-flowing, high scoring era, comparable to what the NBA has become in the last couple years in terms of pace and scoring - and you can see that if you watch old 80s games on Youtube. There is not nearly as much physical contact as you might think - guys were not routinely getting laid out on screens and in the paint or anything. Steph might have taken more fouls from sheer frustration, some of them physical - there were more fouls called in the 80s than today - but other than the risk of a cheap shot injuring him I really don't think it would have been that difficult. It wasn't until the mid 90s or so that the NBA really leaned into a more grinding, physical style with more contact on ballhandlers.