Interesting points about the Sibelius violin concerto. The opening minute or two is very soft and dreamy for the orchestra, with the soloist a little louder so it is still dominant. Orchestra and soloist are playing together in the appropriate balance. Even later when playing together louder, the soloist is spotlighted over the generally softer fabric of the orchestra. The popular violin concertos of Beethoven, Brahms, Tchaikovsky show more of the protagonist duels between the loud orchestra and the silent violin, and the soloist dominating over the very soft orchestra. Thus, the popular concertos are more showoff pieces for the soloist, while the Sibelius has better balance.
Even for the soft, atmospheric opening of the Sibelius, while the balcony offers the ultimate in balance, its markedly reduced HF content vs close seats reduces the actual atmospheric and spatial appreciation. Audiophiles call this "air". In your home audio, you can try adding super tweeters to your main speaker to demonstrate and enjoy this. I use the Enigmacoustics Sopranino in parallel with my main Audiostatic 240 speaker. Another method which I find essential is careful HF boost with my Rane ME60 EQ, which I use in place of a preamp. Boost the extreme HF only, so the midrange tonality is little affected. This is particularly valuable with recordings done with a distant perspective, which I transform into a closer perspective. What do I gain and lose by doing this? Truthfully, the midrange tonality IS affected, but in a positive way by revealing the upper midrange/HF bite of the cello, trumpet, etc. The purist will say that I am distorting the natural tonality. But I regard the muddy veiling of distant sounds as the equivalent of the natural bland taste of aging fruit. Everyone has tasted the more intense flavor of fresh corn vs bland weeks old corn. It takes judicious practice to gain the benefits of revealing the full freq detail of any natural instrument while minimizing the changes in midrange tonality. I consider my methods taking 10 steps forward and 1 step backward.
For learning the benefits of close seating without spending much money, find concerts with good music students, such as youth orchestras or semi-pro events. Get a ticket on the main floor. Start in row 15-20, the approximate equivalent in freq balance to the front balcony. For the next piece, move to row 10, then row 5, etc. For most listeners, row 5 offers the best of everything--full freq detail, balance, spatiality, ensemble. Row 1 offers me THE best detail, although other areas are sacrificed.