Now it's a crutch for people that have trouble with pipe prediction, and now also serves a secondary purpose against buildings. I'm perfectly ok with that.
Sounds like it would be basically useless then. If you're playing demo to destroy buildings, use sticky bombs. If you're not running sticky bombs you're probably relying on either grenade launchers - which you'd want to be good for fights against other players, so either good damage or good mag size- or running melee demoknight where you aren't going to be destroying sentry nests.
No reason to use the new LnL as a pure grenadier loadout rather than the stock or iron bomber, due to LnL having only 3 pipes and it requires direct hits, aka exact aim to get damage out of it. And as a melee demo you wouldn't use a pipe launcher anyway. And if you're running pure explosives with stickies and grenades then you'd probably use stickies to destroy buildings and nests rather than grenades.
One positive with the new LnL is that buildings can't dodge your shots, I guess.
If people have a hard time landing direct hits with pipes then they should practice more with the default launcher than use a crutch. Or play another class less reliant on projectile prediction.
---------------
I dunno why I'm reacting like this to the LnL change, I didn't even use it before. I guess it rubs me the wrong way that they take a viable weapon and rather than adjusting the already existing stats -like, lower the bonus damage or lower the explosive radius or something- they completely rewrite it so that now it seems completely overshadowed by the alternative weapons.