I can only speak for myself but as I got back to the game only few months ago I've never seen or heard about this particular change coming. I feel the problem might lay in what actually people want/expect from Legacy. I for sure didn't come back to play ET just to see its heavily modified game that doesn't resemble what I used to play back in the day. I started using Legacy over vanilla client because it was more modern but at the same time the server felt like old game(even more so than the only alive ETpro public servers).
The community is small, there really isn't much servers to play on and you can only play at specific hours, so when people that played the same game for many many years react like that for even the smallest change(and explosion rework is not small in my opinion) is not strange for me because they are here to play the game they have always played. Even though small, it's rather mixed group of people with different view on the game, some more competitive than others, coming from various mods and so you will get mixed feedback.
Anyway thanks for the write up, it was nice to get a view on how the ETLegacy development is going and I hope that someday the game will see a healthy surge of new/old players.