As I posted earlier, there were several empty stands at the Eastern end, but they are a long way from the terminal so create problems loading and unloading. Ryanair dont use stands down there, and the issue today, such as it was, was caused by 6 Ryanair's on the ground together, taking up most of the stands near the terminal. The delay getting to stand for one 737 MAX was about 10 minutes.
There are economies of scale building all the new stands in one go so that would be cheaper overall, but hugely expensive to do, and extremely disruptive. I'm not even sure they could build 10 in one winter season and doing it in summer is a non starter. Ultimately though, paying for 10 stands on top of terminal works is almost certainly beyond LBAs financial means. Remember that this money has to be borrowed, interest paid, and the bank convinced that loaning the money is a safe bet for them and affordable for LBA.
We saw in 2020 how the unexpected can destroy the airports finances. (COVID). And in 2010 (Icelandic Volcano). And in 2001 (Twin Towers). It would be financial suicide for the airport to borrow so much money and build stands in advance, especially if/when the next unexpected event messes up aviation.
They should, in my opinion, spread the cost by building 2 to 4 stands each year over the next 3 years so we have all 10 by 2027/8, but then there's the runway resurfacing to come too, which is huge job too. Which comes first? I guess we will have to wait to find out.