Will it surprise anyone if I admit that a year later, even after having made the switch and being happy with my current gear, that I actually am still angry with Nikon? I was a loyal customer for many, many years and yet this time, as far as I am concerned, they dropped the ball. I patiently waited when the announcement was made about the new mirrorless system coming, I eagerly looked at all the details after the Z system was announced....and I thought, "oh, cool, I can buy some new lenses and also just use my older ones with this FTZ adapter thingy...." Well, that balloon burst in a hurry. Sure, I could slap one of my older lenses on the FTZ adapter, but....and for me, with aging eyes, this was a huge "but," and a reality slap.... Many of my AF lenses would no longer be AF, they'd only be manual focus on the FTZ. Ehhhh.... A few of my older lenses would not work at all on the FTZ. Fortunately I did my research and learned all this before making any changes in my gear.
I made the switch in systems only after a long period of weighing pros and cons, this-vs-that, and trying to determine what the best move forward for me photographically speaking would be, and I arrived at the conclusion I did, took the steps that I did, and as a result have been very, very happy with the choices I've made, which were right for me.
Others have followed their own reasoning process and are still following their own path, and that's fine, too. We all need to do what we feel is right for us.