Title, basically. Once you understand the game, crafting ascended gear for fractals is pretty trivial if that's your focus, and that's really the only barrier to them, like it would take a few months, but then you'd be golden. LIke sure you have to grind a bit for the AR, but the gold is way better than strikes once you hit t3.
Raids are a bit strange: If you can reliably clear them fast, strikes are garbage. But even training constantly, it's not really that bad of a way to get ascended gear. It's not my recommended route, but I still think it might be more efficient than doing tons and tons of strikes if your squad can hurt the boss enough for the gaeting crystals/magnetite. You wouldn't get as much coin as strikes, but I still feel this might be more efficient depending on what you're doing on the side
I still do them because I think they're fun every now and then, but I just feel like they won't age well, even if raiding dies. I was hoping the drop rate for ascended chests from the weekly chest would be decent but I've done months worth of them and never seen an ascended gear box or a precursor, so even though they're potential drops, the rates are so low fractals are arguably better.
Completely unrelated but still a liability for strikes is the special mastery abilities that are basically required for breaking the bars fast enough. I'm already starting to see newer players who don't have all of icebrood unable to use them. So they may become unplayable depending on the churn in the player base. Not to mention not everyone likes maxing masteries.