I agree, that weightlifting can bring tremendous benefits for martial arts although Im not sure that everybody who is against it is because they're lazy. Some martial artists are concerned about becoming too much like Arnold Schwarzenegger in his prime which would be detrimental. I myself am a big fan of weightlifting. That being said I also agree with you about most of the weightlifting exercises you recommend particularly the back squat, my all time favorite weightlifting exercise although also one of the most hated. I am not a big fan of the bench press and lots of weightlifters will say that particular lift is highly overrated. I used to bench press but now I do flyers with dumbbells instead, I find it overall better and it hits more muscles. Sometimes I will do flyers with kettle bells which I find works better still.
I agree that a 5x5 program is really good, particularly for somebody just starting out. Powerlifting, where you lift as much as you possibly can for just a few reps is probably not a good idea for the martial artist as it can be detrimental and you can hurt yourself. And rest is important, I would recommend lifting three days a week so you get good rest.