Félix's leoInteg plugin for vs-code is one of the most significant events in Leo's history.
First, leoInteg promises to make millions of people aware of Leo.
Second, Leo can piggyback on progress in vs-code. For example, I recently wondered whether vs-can run in a browser. Yes(!), as a quick google will reveal.
Think what this means for Leo. None of the vs-code-in-a-browser projects knows anything about Leo, yet Leo can benefit from any of them.
Similarly, there are several vim-emulator modes for vs-code. No doubt each is substantially better than Leo's vim mode.
Most importantly, in the long run, piggybacking Leo on vs-code means that Leo will ultimately live on. Nothing lasts forever, not even vs-code (or IDE's themselves). However, when IDE's become obsolete, the replacement will likely involve people familiar with vs-code and Leo. That's about as close to immortality as I can confront.
Edward