Chadori, thanks for the reply. That's right, LTS is a good idea.
I think, for example, it's not hard to update Rex's Simplex yourself, I've just never done it.
On the current schedule, SDKv1 addons will continue to be supported in all releases up to around June/July, when the next Long Term Support (LTS) release will come out.
Ashley, thank you very much. I think that's what I wanted to hear. No rush jobs.