I use casual and I've been playing fire emblem for years. I honestly find it expands my tactical options, since I no longer need to twist myself into contortions to keep everyone alive, which means I can use my characters as more disposable lures. If I have, say, Chrom near a forged silver axe berserker and he can't survive the hit, I can have, say, Lissa jump in front of him rather than needing to scrap the whole run. Similarly, it also gives me a lot of leeway and therefore flexibility in where I move and put my units. Easier? Absolutely, but I'd almost say it gives more tactical options.