I only use TT'ing if it has to do with:
1 my golden shovel. NEVER wait for that.
2 Nook's store- If i cant sell, i cant have fun.
3 If i missed a holiday or started a tourney late
and 4: If I REALLLLLLLLYYY did almost everything in the game and i cant do anything else
You can buy supplies you need. I got the complete Robo Set a week after I got the game. In Wild World(before I had Wifi) I spent months and months trying to get it.
I say TT'ing is fine. To each his own. I TT day by day because I can and because I like the game more that way. And isn't a point of a VIDEO GAME to have fun?