I feel like I'm beating a dead horse by bringing this up, but it's an absolute farce that I'm paying for one builder product from your company, and you've gone and created a parallel product, ceased all updates to the one I'm paying for, and expect me to buy your new version alongside it!
I have sites I designed for clients in this tool, paid jobs, which I cannot transfer to the new toolset, sites that require my subscription to be maintained for minor edits as we paid for premium blocks which were essential to creating sites. I was happy to do this, you made it (and still make it) sound like this product is not defunct and is going to be maintained indefinitely. This Bait and Switch with the 'T4' builder is just dirty.
If I were to now go to the product you've decided deserves all the work and effort, and move my clients, I would be out THOUSANDS of dollars in man hours having to completely rework their sites. I'd be happy if you'd just expanded the existing JAbuilder Subscription to include the T4, seeing as you clearly see it as a successor project to this one, then I could have maintained my older clients and transitioned any major upgrades over to the new builder without paying essentially double for the same tool. (and no, a discount is not an acceptable compromise when I'll still be stuck paying a premium for a defunct service alongside it)
I know I'm having a bit of a rant here, but I pay good money for a product here and it feels like I'm not getting what I'm paying for anymore, I feel like I've been scammed, and now I'm in a position where I'm locked into paying for a tool that I can't even use with confidence anymore.