All this is doing is ALIASING the sound from ANOTHER AIRCRAFT. This does not create aircraft accurate sound sets. OP is bemoaning the fact that some payware aircraft are not coming out with full super deluxe sound packages like the default aircraft do.
As a developer this is something that we are tackling right now with our upcoming aircraft release. Any existing sound set is made for the FSX/P3D sound engine and when compared to what is available in MSFS is quite limited, the sound quality too is also vastly improved over FSX/P3D. So this requires that we need to either acquire a whole new sound set mixed using the new WWise system or stay with the limited sounds we have. WWise is quite new to most developers so there is a MASSIVE learning curve we are facing for this sound system on top of the changes to everything else.
This means we have to either take the time to learn the software ourselves or pay a contractor to do that for us. Those sound engineers with the skills to create WWise sound sets are able to charge (rightly) quite a hefty premium at the moment that I’m sure most smaller studios like ours are unable to afford for a release product. Some developers like DC Designs are updating their aircraft after release and so you may find your favourite plane gets better over time. Other developers perhaps are unable to spend this time or funds on an already released aircraft and have to move onto the next one.
We really have NO IDEA how much effort, dedication and skill goes into creating the aircraft we fly until we try to create one ourselves.
OP paid CND$20 for the Aerolite 103. Well I feel that is very good value for money. Pretty sure those sounds are close to the real thing, but that’s also a budget price so unless it sells like hotcakes, there may not be a lot of incentive or return for the developer to further improve the product. From all reports I’ve seen from YT like @BelGeode et al, it’s a great fun aircraft and pretty decent value for money. Value however is subjective so YMMV.
TL:DR Creating aircraft is hard AND expensive. All devs are still learning the intricacies of this new sim and things will improve with greater experience.