On the opposite side of my LRM focused list, I have a close-in-assault mech list that I like to run using lots of short range AC/20 weapons, a few quirky mechs (the urbie) for the lolz, and a number of dedicated energy mechs- in this post taking a look at the Ostsol.
With an energy mech we don’t have to worry about ammo in theory- as does one every really run out of ammo in a game? BUT with ammo there is the chance of an internal explosion from a crit hit or heat. Energy based mechs ignore this, making them much more durable as it takes a bit more ton for ton to put them down if you don’t score a luck head or engine hit.
I use the Ostsol as my close in mech for when I have to physically grab an objective or hold a certain point. With two large and medium lasers in the front, and two medium lasers in the back it can fire all is gunz and grab stuff or brawl away. As a heavy mech it can take some damage, and is a bit more resilant due to the nergy weapons and potentially being a zombie mech- arms blown off but weapons still up.
The Grasshopper, perhaps does it better?
Not a full energy mech but the small LRM ammo doesn’t seem like that much of a threat.