No you can't leave the playmaking to messi thats what led to messidependencia. Neymar is arguably the 2nd best playmaker after messi and is a much better creator than finisher. If you think the opposite then fine its subjective but most think what I think.
I know he is the 2nd playmaker and I'm not saying he doesnt have playmaking qualities but him being a heavy playmaker means Messi would need to take up the goal poaching role more. But in this case, Messi isnt as good as a goal poacher due to his lack of speed and physique and possibly shooting power. Messi would actually be more "alone", if Neymar decides to playmake with him, because Messi has less options to pass to and would only have Suarez or Gomes upfront.
The reason why Messi flourished so much in 2014/2015 is because he had alot of options upfront and can easily pickout either Neymar or Suarez, who were constant threats in front of goals, and his creativity output explodes here.
If u think about it, Messi was actually doing much worse when Neymar playmaked alongside him because Messi would need to comoensate and take up Neymar's previous role. Which is why Messi scored so much goals in 2016/17 but you realise they arent very effective against top sides at all.
When u change something, other has to compromise but this is when their roles dont really fit well when switched around. Their horrendous season is a clear evidence that such a system wont actually work well at all. Their roles in 2014/15 still remains the best and the most effective and were unstoppable.