The steering column failure was as bogus as it came. It was a cop out excuse made to blame Williams F1 as it was the easiest excuse one could do because anything else would have essentially put the blame squarely on the most popular driver on the planet, and a triple world champion to boot.
Going back to his Lotus days, Senna was notorious for trying to alleviate car handling issues by running the ride height of the car as low as he possibly could. Trying to create that ground effects seal with the floor was attractive to him when he needed another tenth or two. Where that comes into play here is that the FW16 was ill-handling in the rear of the car. Williams had been so involved with the active suspension in 1992 and 1993, they were simply behind on how to build a traditional suspension without the active parts, that they basically ...... up. It was compounded with Newey's aero approach with the rear of the car, so you had a car that was prone to understeering and oversteering on the same lap. Hell you could approach the same corner on two consecutive laps and have different handling characteristics.
During the morning warm-ups on May 1st, Senna was still unhappy with the handling of the car, in spite of alterations made to the FW16 that were supposed to provide a more stable rear end. In between the morning session and the 2PM start time, he decided to make a setup change with regards to the ride height of the car and went lower as he was wont to do.
Fast forward to the race start, you had the accident with Pedro Lamy and JJ Lehto when the lights went out, and the subsequent safety car period with that piece of .... Opel. Once the lights went out on the safety car, Senna caught the entire field sans Michael Schumacher napping and took off coming out of Rivazza. That started lap 6 under race conditions. As a side note, during the morning review with the team, he told Damon Hill to take an outside line through the Tamburello as the inside line had an extremely bumpy surface, and was likely to upset the car. On lap 6 Senna took an inside line, and you can see the car bottoming out with a huge shower of sparks. In fact that whole lap, you can see is on the limit. I've seen the full onboard from Tossa on lap 6 all the way to the Tamburello on lap 7, and he was driving like a man possessed. Sets the third fastest lap of the entire race on a restart lap with cold tires. In any event, the car was bottoming out the entire way in spite of the tires getting up to temperature because the track surface was spotty and he was running lower than what one should have been based on track surface. He bottomed out on lap 7 going into the Tamburello, and you see a shower of sparks come out, and instantly the car veered right off the track into the wall.
No one wanted to blame Senna because no one wanted to believe he basically ...... up and didn't get away with the mistake. He made plenty of mistakes during his career, but most of it gets washed away with the Saint Senna ......... He was desperate for a race win come Imola, and was not prepared to accept anything less even if it meant driving the car on the limit for 60 laps. The smart play would have been to drive for the points even if it meant Schumacher winning, as he would still have been on the podium. It's what Alain Prost would have done as you score points and wait for your team to work out all of the kinks which they did do.
The biggest change that lends a lot of credibility to the ride height, and the inside world of F1 knowing it was down to the ride height was when the FIA mandated the skid plank under the car which effectively established a minimum ride height of sorts as you could only have a certain amount of wear on the skid plank. We've had it for over 20 years now for a good reason. That was why the cars stopped sparking underneath because they weren't being run millimeters away from the ground because the plank wouldn't allow for it.