Friendly bit of advice. Stardew valley is a game at your own pace. If you feel frustrated by money, take a minute and slow down. The game should not be a rush of constantly buying everything, and it's ok to slow down, relax, and take longer to accomplish a goal. For many people that is the fun of the game!
I assume you mean the item id exploit, it's still in the game and actually more versatile than it was before, it's just changed up a bit, there's a post in the guide section with all the new ids
Nope, you only ever lose money and energy, and that's been the case for basically the whole existence of the game
He very much hasn't, mods just need time to update, you can't expect everything to mesh instantly after a large update that served primarily to make modding more viable. If anything, the mod makers have much more freedom and ability to change what they want with the game than ever before.
That's actually really interesting! I didn't know it was still around. Come to think, I did hear someone talking about updated item ids and how items could no longer be substituted for another, but it didn't occur to me that it would apply to this exploit as well.