Now that he finds himself on jury duty for such events, Ohlsson can see they still have their place. "Although there are a couple of major international pianists who didn't win a big competition, they are the exceptions to the rule."
This pianist, who once likened the difference between live performance and recordings to that between theatre and film, finds the distinction between a concerto performance and recital work simply "apples and oranges".
He sees a solo concert as being "like a soliloquy or poetry reading whereas, in a concerto, there is this give and take of tremendous energy between soloist, conductor and orchestra, especially in a splendid symphonic work like the Brahms".
Talking conductors, he has fond memories of working with the late Wolfgang Sawallisch and Klaus Tennstedt, with whom he made his magnificent 1979 recording of tonight's Brahms Concerto
Today, he only asks that conductors be well-prepared. "It may sound fundamental, but some have to do up to 18 full symphonic programmes a season, and maybe an opera or two. No pianist on earth could match that."
When it comes to pianos, he says: "A concert grand is a racing car. It's not what you go down to the shop in to buy a litre of milk. It makes no sense at all to get an expensive Hamburg Steinway and not look after it.
"If a piano hasn't been taken good care of for a while and isn't sounding too great, then it's a little like going to the dentist with bad teeth. By the time you have a problem, it's usually a huge one."
Ohlsson is philosophical about his senior status, one of the advantages being that "people treat me nicer".
"Although one does get older and is never prepared for parts of it, my experience means I can handle situations and personalities that are difficult. I have a larger variety of tactics. I also get to play all my favourite concertos," he chuckles, naming the Beethoven Fourth and Fifth and Brahms' two scores.
His description of tonight's concerto makes one impatient for the concert, as he talks of "the pianist and orchestra slugging it out in the first movement recapitulation" and "a cathartic Finale that, like Beethoven, works through from darkness to light".
The composer has long been a favourite for what Ohlsson describes as his spacious style of writing.
"When I was younger, I felt he didn't write enough notes. I don't agree with myself any more."
Performance
What: New Zealand Symphony Orchestra
Where and when: Auckland Town Hall, tonight at 7.30pm