My playstyle often results in an endgame where the LCS acts 'openly'--that is, I amass a well-armed well-trained force that enables me to stop worrying about reducing heat and moving safehouses, instead breaking sieges as they come and repeatedly assaulting the police station to keep them out of commission.
I enjoy reaching this level of combat superiority, but it lacks a climactic ending. The same battles keep recurring unchanged, and once the thrill of blowing away the forces I used to fear wears off, it's a bigger nuisance than managing heat was as I continue to pursue a public opinion victory.
Some of the sites (especially the bank) provide satisfying final challenges for infiltration-type skills, but nothing does it the same way for direct combat. And ideally there'd be something that ties everything together.
Thus, I propose an alternate victory path of executing a coup d'etat. It might look something like this (details don't have to be this way, but they should give the idea):
1. Attack the White House. Rack up enough kills, and you can take over the site (like how CCS safehouse takeover used to work) as a safehouse.
1a. Maybe have to do the same with other important buildings?
2. Hold your new territory against a brutal military siege.
3. Learn that an arch-conservative provisional government has convened itself at an undisclosed location and established martial law.
4. Find a sufficiently important conservative and convince them to disclose said location. And try to do it quickly, as more of those sieges are coming.
5. Launch a raid on same location, which turns out to be a heavily-fortified bunker. Getting in the front door requires stealth/disguise, security, and computer. Once inside, you encounter a checkpoint that cannot be passed nonviolently. This triggers the alarms, and the leaders lock themselves in an impenetrable panic room. But all is not lost--the compound's power is generated by a nuclear reactor. Fight your way to it, and mess with it to make it look like a meltdown is imminent. The leaders' security will then change plans and attempt to evacuate them. Intercept them en route, take out the security detail and the leaders, and fight your way back out, and you've won the game.