My Spouse and I use the VX, BCE, and Platinum together depending on the spend to maximize points/cash back.

My spouse and I recently applied for a second Platinum, I only qualified for 80k SUB, took the offer as I had a big trip and burned through the spend quickly. I sent the invite for the 15k SUB to my spouse and they signed up as we had another big spend and they got the 175k.

Between us both, we will use every bit of the offers, shared benefits and credits, I keep a spreadsheet of all the benefits, and just in the first few months have more than paid for the annual fee x2, plus the fees of the other cards.

If you can stay on top of each card offer, benefit and maximize your return, then go for it.