Joy,
The issue is that your suggestions ignore even the fact that bots that have been operating for long periods of Months+ in the same manner the whole time aren't changing patterns or anything, they just operate and nothing is done. Your 'trust' is akin to going "they don't bother me personally and I don't care so whatever happens to them happens!", sorry but some people want something done to actually deal with those. Your statements would hold any water about SE taking action if we actually saw those long term bots go away, if even one was dealt with and I didn't see the same ones at nodes, or the same ones sitting in their apartment all, the, time.
Your ideas also aren't that well thought out because as has been brought up there are a myriad of tools and ways that they could identify the bots quickly without even changing game code and address them, in ways that it would be painfully obvious that false positive is highly unlikely, and they have ADDITIONAL means at their disposal that they could run that we don't have access to, yet we are already identifying bots with reasonable certainty. (things such as gil gained in a time period wouldn't be hard since inventory changes to a characters currency and all would no doubt be logged someplace for some time period, and who gold is sent to etc since they likely use such data for RMT tracking anyway). So your doom scenarios are pretty half hearted at best and more come off as crying that the sky would fall if they took a harder stand on the botting.
I don't think I can't have fun, I try to enjoy myself as much as possible with my FC members and where I can, I personally however feel the game could be healthier and more entertaining for the many by dealing with cheaters. Wanting the game to be entertaining and have a healthy PLAYER economy and fun for all PLAYERS without them needing to jump through hoops to play around cheaters is not such a horrible thing that you seem to make it out to be.
Your whole thing feels like if you joined any game where people were cheating and just told everyone else "Just play around them." while the cheaters kept coming through and messing up things for people. Then when they go "The developers should deal with these cheaters!" you come back and go "But you should just avoid them and it'll be fine." and now "The devs shouldn't make changes because it might break something to try to fix the problem! I don't have faith they could do that so best not try!"