I mainly work on Windows, something like 90% or more. Here installing a functional online-help is no problem at all - just check it in the installer, and it works out of the box, confirmed with the recently published Lazarus 1.8RC5.
I'm not saying it is good, though, and I only rarely use F1 because the online help for most topics is non-existent or or trivial (i.e. making obvious statements). Source browsing, on the other hand, is extremely fast, must faster than lhelp to open even if it finds a help item. If I need additional information I use internet search, forum search, wiki (in this order, given by the power of the search tools).