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sure bro... and yes imo those are all improvements and nice for first time builders with little or no tools.
imo to have a non threaded takedown pin detent on a modern lower is ignorant.
I suppose the Aero M4e1 could be considered "nice for first time builders with little or no tools". IMO they are a shortcut rather than spending the time, effort and few dollars to do it right. Some consider those changes "improvements" but I assure you they are not.
One of the outstanding features of the AR-15 is it's modularity, it was designed to be rebuilt, rebuilt and rebuilt. There are AR receivers in military armorers that are decades old and have been rebuilt multiple times. Little tiny threads in aluminum are a bad thing as they are too easily stripped out rendering the receiver useless over what should have been a 2 cent part, there is a reason for the roll pins and captive detents as originally design.
The integral trigger guard, aside from sucking in shape, does away with more modularity and eliminates another design feature, the ability to fold the trigger guard out of the way to be capable of use with heavily gloved hands in severe weather. I'm not likely to replace a trigger guard on a factory built gun with a specific reason but if I'm build something for myself it is getting a KAC trigger guard and don't need an integral one getting in the way. That tension screw thing does nothing other than add complexity. A little play between the upper and lower means zilch, if wobble is really that big of concern up the quality of the product with something like a SOLGW receiver set, zero play.
There have been and are legitimate improvements to the original design but you're not going to find them in Aero M4e1. All that said, I highly recommend first time AR buyers to purchase a quality factory gun or complete components as I mention above rather than assembling one. First, it gives them a proven benchmark to work with and learn from, and second, if they decide it is not for them and want to sell it, it will be much easier to move than some cobbled together POS put together by a novice (they just don't sell well). Third and lastly, how many thread titles have you seen that read along the lines of My home build AR jams and won't "X,Y or Z", now ask yourself do you really want to rely on what may be your one and only AR, something for serious use that you built without really know what your doing? After becoming familiar with a reliable duty grade weapon, then go the rabbit hole of building if desired.
OP, find a Colt, BCM, SIONICS, SOLGW or the like with a history of duty use.