Interesting how this can be different in a B2B setting. I run a B2B SaaS and consider personal support to be very important. While I do see some of what the OP described, the overall experience is mostly very positive. I enjoy talking to customers and from what I see, most customers appreciate honest responses, even if those responses explain why something can't be done right now or is much more complex than it seems (all too often).
The difference is that my customers are mostly engineers in small to medium sized businesses. They understand that 1) ongoing development costs money, hence subscriptions, 2) there are no magic wands and things are indeed more complex than they seem.
This is one of the reasons why I don't want to get into B2C. At a first approximation, people just don't want to spend money, hate subscriptions, have zero appreciation for how much ongoing development costs, do not understand that the money has to come from somewhere and that $5 purchase 6 years ago really doesn't cover the costs, and do not understand the complexity of software and product development.
Even here on HN, if you read the comments, there is so much blind hate against subscriptions, with little (if any) consideration for a sustainable software business.
Incidentally, I thought personal support would be a competitive differentiator, but I don't think it really works that way. Yes, customers do appreciate it a lot, but so what? Business customers don't talk to each other much, you won't get "viral" recommendations. And new potential customers have no idea how your support works, they think it's the same AI chatbot and knowledge base search as anywhere else.