I mainly look at this from a national contest angle but even in a local type league I prefer hard rules that don't bend. So to me this does in fact fall under the category of tough injury break, horrible weather event, etc,etc.
In the first year of the FFPC a hurricane hit Houston and cancelled the Texans vs Ravens game, was moved to a different week. That was back when waivers only ran on Friday(I think, maybe Wedensday), game got cancelled the next day and my only D was the Ravens. I assumed an accommodation would be made for an unusual event and was furious when my attempts to get waivers open to pick up a D or have the stats for that game added retroactively when it was actually played. When that game was eventually played the Ravens scored 9 points, I took a zero at D that week and missed the playoffs by 2 points. And you know what? The FFPC was 100% right and I've said this numerous times. Rules are rules and when you start bending them, most especially when you are able to directly see who it might benefit that's a horrible slippery slope to go down.
Some people bring up some rules changes brought along in-season by COVID as bending the rules but a major distinct difference exists. The main rule change brought by COVID was simply adding a second waiver run. The major difference is that is a not direct benefit to particular team(s). The operators of the contest can't play favorites, see who it helps, who it does not. It's a rule change made available to all.
So to me for the national type contests it should be really simple but honestly I'd feel the same way in any league, even a local. Which to me is even if the game is continued another week it does not count. If the game is never continued and the NFL deems the game a no contest and does not officially award stats from that game then the stats don't count. If the NFL labels it a complete game then the stats count as is.(which so far is NOT what the FFPC is doing and I think they are handling this poorly)
To me it's really that simple. Now if anyone in a local type league impacted said to the commish go ahead and let my opponent use week 18 or whatever that's fine but these type of decisions should not voted on or decided by the commissioner IMO as you now get into popularity contest, personal bias, whatever. Rules are rules. That's how I like my fantasy leagues run.