Onagoth the striker issue with the M&P's involved the early guns and hasn't been an issue for some time. S&W changed suppliers. I believe.
The top shooters in IDPA/IPSC could win with darts blindfolfed.
To some extent you see a herd metality, note the interest in 6" 1911's in the US since Rob Leatham won a tournament or two using one. There was a rush on XD's after he won a tournament with one in his hands. Glocks, M&Ps are popular in SSP Division shooting 9MM while the 1911, Glock and M&P's are strong in CDP. CDP requires you to use .45acp.
In the US a lot of shooters shoot IDPA with guns they carry daily which is one of the reasons you see a lot of polymer guns at IDPA events as well. At State matches I have seen just about every type of gun suitable for carry on the hip and some that really weren't. IWB, Paddle and Belt holsters, leather, Kydex and half and half.
Sean Hanson and I agree on a lot of things and one we absolutely agree on is the worst reason to buy a handgun is to limit your choice to whatever the top shooters are using. Lots don't agree and tend to follow whatever the top shooters are using. My advice, buy what you like and shoot for fun and a lot.
The stats are interesting though.
Take Care
Bob