No, not really. First I wanted to disagree but after some more thinking: it doesn't matter for the game if you use an XL fusion or a ICE in your vehicle. When it comes to campaigning the ICE driven vehicle with a chemical laser suffers by the need for ammunition but is cheaper.
Only when you are a special snowflake that wants to have "reasonable" costs for a highly efficient vehicle - the combination of FuellCellEngine and Chemial/Cartridge Whatver Energy weapon is hard to beat.
I've found the expenses of the chemical laser ammo often offsets the cost a lot. At 30k C-Bills per ton (all versions), it's frequently cheaper to take the fusion engines and just accept you'll need power amps or heat sinks. And if you're packing an array of Medium Chem Lasers, that's going to be a lot of ammo...
Oi and we need chemical lasers for IS advanced technology during the succession wars era (I get a FCE for my Goblin, now give me a large chemical laser so that I can keep the SRM)
Yeah. Honestly, these lasers would have made much more sense being SW-era (or even earlier) IS weapons than Clan weapons.
I mean, what's the purpose of them for the Clans? They're awful on Battlemechs. They're passable on vehicles, but the Clans don't respect those very much. On Protomechs, each heat sink is a quarter ton so the vastly superior ER Medium Laser is only 2.25 tons, and if you need a punch around the 1-ton range you're better served with Clan missiles...