Is it worth it to wait for the end of duoluo dalu, to start reading the 2 and 3 ? No spoilers or anything. This is because i am actually waiting for the completation of the translation.
You can start reading them, there is no really big spoiler, at most some allusion and light links between them
I think so, because if I remember correctly, the very first chapter of two has spoilers for 1. Plus, one should be done this year so it's not all that long of a wait. Just find some other stuff to read.
I personally am waiting to finish DD before starting DD2 however I didn't wait for DD2 to finish as I have read DD3 until c700 so it is just your preference really. I want to finish the first properly before moving onto the direct sequel, and by waiting for DD to finish I would also have a lot of DD2 chapters to binge, so it is just a matter of preference. The only major spoiler you will find in DD2 is in the prologue, other than that for most of the novel there are only links such as this is who the founding 7 shred devils were, the academy, and that's it, nothing more, the author wrote DD3 the same way, you only learn what the characters of the from DD2 were called and that's it. So go for it, if you don't really want to wait for DD
At worst you can try the MTL of DD. People usually (almost always in fact xD) cannot bear to read it but it's complete and all in all if you put a little bit of time in it you can understand at least 80% and i'm not that good in english to begin with... Well you will read way more slowly than in a true translation btw.
there's a google doc somewhere with super in depth spoilers so you can just read that and the wikia for spoilers if you are in a rush to start DD 2 but yeah there's references but no real plot is spoiled especially now we are at the point in the TL'ed chapters where tang san has become a successor