As a fairly old climber I can report that I was unable to go to any of my favourite walls and hang out, doing circuits, with my pals. I was able to use my home boulder boards, campus board and hangboards. The result was that I got a fair bit stronger and regained some power. That’s despite being so old I should be losing both strength and power fairly fast now.
The big difference for me was how I used my home set up instead of “the wall”. All my home sessions were planned, focussed on training objectives and short. My wall sessions were unstructured and long. (I had paid to get in so stayed long enough to get my monies worth.)
To summarise
indoor bouldering .... organised and focused = win
Indoor bouldering ... random = loss
So for me .... it’s wasn’t the indoor bouldering it’s what I did with it that made the difference.