Yep, 100% agree with both. I play on iOS (iPad) with no wifi, or WiFi toggled off sometimes and the game plays perfectly. Mobile doesn't have multiplayer, so there's really no need to be online with Stardew, other than maybe to check the wiki! Lol
Controls are fine, I can do most things with touch but planting is slower for me (speed planting or harvesting is easier with a controller paired, but maybe that's just me, I can't get it it work consistently with touch only). I bought a cheap $30 Bluetooth controller and paired it and that's amazing. You still do have to use touch for drag input things like loading tools that accept inputs, equipping clothing/items, stacking trashing items, auto-sorting since even though I have plenty of controller buttons for those functions, the game refuses to recognize them. Either that or it doesnt like my controller, I think (but could be totally wrong) that they didn't expect fully buttoned controllers to be paired or controller-only use on iOS and so didn't program it for that. That said, the items I mention are used far less than the main controls anyhow, so the occasional screen touch is not a big deal.
Fishing without pairing controller is okay. I agree with Boo, it is the casting that's the pain lol, the rest is completely fine. Fishing was the main reason I paired a controller, because at the beginning I really had no idea what I was doing, which made it 10 times harder, and I figured that a controller would make it easier (I hadn’t yet made the connection that fishing skill being low was the real reason I was bad at fishing lol). I also have not the greatest fingers for touch speed accuracy (numb), so thumbs work waaay better for me.
Also, I found out my accident one day after playing too long, that my Bluetooth controller (which wouldn't turn on to use if charging) would work while charging/plugged in, if I just paired it and started using it first,
then plugged it in. I'm not sure yet if this discovery is good or bad, because it facilitated some ridiculously long play sessions.
I will say that switching up controls after becoming accustomed to them on another platform can be tricky. Sometimes it is what we get used to, though if wanting freedom of mobility larger mobile or tablet is great.
I cant bring myself to transfer away from mobile due to its overwhelming convenience. I tried going to PC keyboard/mouse after iOS touch and paired controller and didn’t like it at all... though with a controller it was fine. Pros and cons to each.