Of course you don't have to have a filter pre-amp on an ACG. The ACG preamps are made by John East for Alan. Alan will fit one of John's own products if that's what you prefer.
I've 4 ACG's, a J5, a fretless, and Uber spec custom and bass that I had made specially in memory of my Mum. Weight wise they are a product of the woods chosen for construction and even within that some woods from the same tree can be more or less dense. If you want a lightweight bass Alan will build one. My Uber spec is particularly weighty but the tone mirrors this and being the beefy bloke I am I find the weight irrelevant.
I switch from asymmetric neck to a variety of sections and don't notice it to be honest. All I do know it that the ACG's feel like coming home
I have a P (I have 2 actually, and a P/J) but I'd not pay a lot of money for it as a P is a P is a P....
P (eter)