Yes, I believe that to be the case. I don’t think memory methods improve natural memory as you were expecting. They need to be applied for you to see any effect. After you start using them, their application starts to require less effort, though.
That being said, some may still argue that memory training improves memory because it’s a type of mental exercise, which may reduce cognitive aging. I think that makes sense, but then memory methods wouldn’t be any different than any other challenging activity in this regard.
Although your natural memory is the same, you can still apply your new knowledge of memory methods to improve your daily life, so let’s analyze the problems you mentioned and find solutions:
This is just a bad habit. I would recommend you to have a place in your house where you should store all the things you need to take when leaving the house: house keys, car key, wallet, phone, ID, credit card, bus ticket, or anything like that. Initially, make the conscious effort to remind yourself to use this location, and after a while it will become a habit.
This is one example of how memory training doesn’t improve memory. Indeed, you won’t remember the name if you don’t apply the method, so I recommend you to associate the name of the person to their face. Another option is to simply pay attention to their name and say it back to them a few times during your first conversation.
This is maybe one of the hardest things to solve with memory methods because your past includes so many things that would be impossible to memorize all of it using the methods. Something that may be helpful would be journalling, which could include the most important details of your day. I’ve found it very helpful to have an all-in-one storage of ideas, experiences, and memories that filter all the important ones. If you forget something important, you can still recheck it there. If you reread some days there, you may even recover the memories of that day. They weren’t necessarily lost, but just unaccessible, so reading the journal can trigger the memory back.
Something else that you didn’t mention, but may be happening as well is forgetting daily tasks, like forgetting to take the trash outside when getting home. For this, I would recommend you to have a to-remember memory palace, where you should include all information you want to remember for the day. This won’t have an in-built alarm that will notify you to do something, but if you get in the habit of checking this palace many times throughout the day, you’ll rarely forget the items you put there. To avoid ghosting, you may use a very long journey. I myself use the path from my childhood house to my high school.
An alternative is to associate the task to a place you’re gonna walk through at the moment you want to remember the task. For instance, you may imagine a giant garbage dirtying the front of your house. When you get there, you may remember the mental image and therefore the task too. This is the only way I know of building an internal notification system.
what argument do you think I was making in the sentence you chopped up 
and what does that have to do with what you are saying underneath it?
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