About your question... As i said in another thread at the end of the day is all about tastes people have about entertainment and art.
We are all Shenmue Fans but we have different opinions about what we want from a Shenmue game, if you don't like the food system then play on PC with mods like Spaghetti said, and in the PS4 version you can play in the NG+ option like banenes said, this way you will not have to worry a lot about training and things like that, maybe this way will be more enjoyable for you.
Before Shenmue III release Yu Suzuki said this to the players...
Yu Suzuki: It would be nice if players felt like coming back from a journey. If you hurry through the game, there is a good chance it will just stress you out. Rather, by taking your time, the experience will be one of trying all the different things the game has to offer.
Yu Suzuki: I would ask everyone to take your time to play and not hurry through. When you come upon something you like, just stop and hang out for as long as you like, trying all things the game has to offer. For example, if you’re someone who doesn’t like gambling, try it in Shenmue and you may just have fun.
I did what Yu Suzuki said in this interview, i played Shenmue III in a slow way, i took my time with the game, i played for more than 80 hours and it was a beautiful experience to me, when i had the option to leave Bailu Village and go to Niaowu i didn't do that, i stayed in Bailu Village for long time after deciding to go to Niaowu.
One of the reasons i love Shenmue III is because the game is calm and peaceful. To me Shenmue III is the calm and peaceful part in Ryo's journey, specially in Bailu village, so i love that the game is like this and Bailu Village is one of my favorite places in the Shenmue World, i love the night conversations with Shenhua and that now the bond between Ryo and Shenhua is stronger and much more.
The game could have been better? Yes, telling more about what Iwao and Sunming Zhao did in Bailu Village, more character development for the side characters in Niaowu, Baisha in the game and much more, but about Iwao and Sunming Zhao maybe Yu Suzuki want to show this in another way, the story is not complete so is a possibility, i hope we can see flashbacks with Iwao and Sunming Zhao.
I really feel that Yu Suzuki wanted to do more with the game but for some reason he had to release the game soon as possible, maybe because of Deep Silver, i don't know, i remember that the game was delayed 2 or 3 times.
The ending is rushed but i like the ending, i like that Ryo lost the fight but show that he is improving little by little, if a final fight happen we will probably see Ryo winning, we will probably see his evolution and i think this will be beautiful to see.
I love the training in this game, i love that after training we can see that Ryo is getting stronger and enduring more without eating, i like the food system i just think it needs improvements but i like this RPG elements in the game.
I just finished Shenmue III one time because after that i played other games but i want to play again, right now i'm playing the first game again, after that i will play Shenmue II and Shenmue III again, i really want to play Shenmue III again, it was a beautiful, peaceful and good experience to me.