As much as I like challenging solo content, please for the love of twelve don't make it mandatory. Don't make job quests, or main story quests super super challenging. You forget not all players here are capable of it, some physically. Some players may have poor reaction time or other issues preventing them from playing at a high capacity. It's unfair to make it so they can't do the last job quest because of it. I'm all for adding in other side quests that solve this. Personally as a solo player myself, I'd rather not see hard content but just in depth content. Long chains to work towards that culminate in something awesome. Something I can do a few steps at a time when I have the time to log in.