some zone tweaking would be needed to make sure that some of the top tier zones still required real people
Arctic zones don't need any tweak. That's the natural knee-jerk reaction, but it's the wrong one. Arctic zones are plenty challenging as is. I cannot tell you how many unrecoverable mass rips I've had of 8+ chars at once during the initial development with my first bot crew of Monika, Domahnugnuts and as well this wipe with Aemon, Yhonk, and co.
I had a mass rip with no CR like a week before I got gear stripped at Argentine in Vingaard Keep. There are certain zone features or mob specs that you take for granted as a human player that pose unique challenges to bots.
Some mobs that are trivial to a group of human players, become a nightmare for an all-bot group, and you develop a newfound respect for them. I am actually terrified of a certain mob in Sanction that most groups would consider trivial.
I don't think creators should take bots into consideration when they do zones. The character level/power is unchanged whether it's botted or whether it is in human hands.
People have this perception or mental image that if you have 10 bots you can just steamroll everything and kill everything in sight. I assure you, that's not the reality. It takes dozens of mass rips before all your scripts/code are sorted out assuming you script all char classes. And that's only your client-side scripts, not to mention the time you gotta invest to tweak your server-side JSON/RPC/socket calls.
Before people start asking for changes to the game due to botting, I recommend you first try botting in order to see what it's really like. When you start mass ripping your initial bot crews, you'll find the difficulty of Arctic is more than adequate.
Bear in mind that if botting is allowed, exploration will also increase exponentially (which is a good thing because more people will gain zone knowledge.) In this process of exploration, there will be lots of deaths.
I would really hold off on any suggestions of tweaking the core gameplay because of botting unless you've actually tried running zones with 9 bots. Otherwise you're just talking out of your ass.
but in general, it would be nice to log on and go "okay i've put in my 500 hours of playtime, now it's time to go solo qualinesti" or such with some rentable bound and summonable bots...
It is nice and not nice...because then you become to caretaker of everyone's decays. I actually did have to spam quali for a number of clannie decays. But again, you're not factoring in, the 200+ hours of scripting and coding needed as well to get you to a point where you can actually do that.