It is always a little risky to step into a discussion on game design especially if you are yourself a game designer. So, I will restrict my comments to what I know. I have never played Maurice so I cannot comment on the mechs mentioned. As far as the evolution of BLB is concerned I wanted to offer players something to mull over as we continue to broaden the period's appeal (and that has definitely happened).
BLB evolved from my experience of a very simple set of WSS rules created perhaps 30 years ago for WHC weekend games.. simple to pick up for the uninitiated and reasonably quick and bloody. I got hooked by playing with a group who already knew the rules very well. I played over 80 games with them and got to know the ups and downs(there are such in every system). As the rules were originally written for WSS and my interest was in the far more interesting earlier period
BLB evolved from there. Some of the anomalies and what I perceived as clunky-ness was ironed out in BLB1 and some(all I hope) of BLB1's gaps and greyness disappeared with BLB2.
Ironically, the unit sizes I opted for with BLB are not characteristic of my style of show games ie.. the model to man ratio is too high and thus unit are generally smaller than my mental vision of wargaming. As a consequence, Clarence and I have been discussing/ pondering/debating but not disagreeing! on an evolved BLB that maintains everything we've achieved so far but allows an optional gaming world in which units are larger than the current 18/6 Foot/Horse. One of the chief drivers here is my fixation with smaller engagements in which far fewer units took part. Small games with small units although a great lead in with little/no risk are not my main motivator. I am therefore considering an optional section for BLB which users a much lower model to man ratio say 1:10 or 1:15. This will allow the fielding of small forces of larger size. Cavalry 'Troops' could even be represented in some cases but mainly I am thinking Foot units around 30-50 models strong and cavalry regiments(with sub units) of up to 30 models. A gun would represent 'a gun'.
Basing etc would be unaffected but I foresee even more period nuance possible. The whole thing is not a pipe dream but is pretty imminent. Clearly not for everyone but those interested in small actions.. Ireland, Jacobite Rebellions, Sedgemoor, Tangier, such as the delaying action at Walcourt before the main event etc.... this could be handy for you.