This sounds like a great compromise between the expense and expertise of all grain and the convenience of commercial extracts. The problem is one of being a jack of ll trades but expert of none. Kits are not able to emulate the beer they are trying to mimic reliably because they are need to be shelf stable for a very long time and produce consistent results.
The contents of your tin are limited for this reason. Malt, hops and few flavors are not going to comprise the complex contents of either small, finely tuned craft brewing or the large scale commercial breweries. It is simply too complicated to accommodate in one, fool proof consumable.
That does not mean that these kits are a complete waste. They can be used as a convenient means of storing malt and a basic recipe kit for brewing. They are also useful for the first few attempts at home brewing beer. That is because they are simple and direct.
You get just about everything that you need in one package. Yeast, sugar, flavors. With a basic, bare bones brewing setup you could be brewing your own in under 30 minutes. This is why the gift of these is not inherently terrible but the continued use is. They lack the ability to grow and adapt beyond a certain point.
This is both the other advantage to this basic recipe and its major flaw. You can adapt, modify and alter the kit for the better. A simple change is taking more suitable, unrefined or processed ingredients like malt and using this. Replace the more fermentable sugars like glucose with malt, wheat or similar complex saccharide that will produce more complex flavors.
Over time you can modify and change more parts of the kit. Going from relying it on as the main part of a beer brew to relying on less each time. Perhaps the earliest change should be using a properly sourced, stored and appropriate yeast strain. This will help considerably in creating the right by products, flavors and fermentation of the right sugars.
It will eventually get to a point where you no longer need most if not everything in this tin. Malt is easily purchased in dry and wet form. Glucose is easily purchased. Hop pellets are available form most reputable home brew suppliers. Yeast is both available in commercial packs and as a rescued strain from live beer. Nothing in the pack is unique once you are comfortable handling the ingredients. This will allow you to make something better than what is in that tin you were gifted.