I have been in touch with TIDAL about this. The limit cannot be increased at this time and TIDAL indicated no plans to increase it in the forseeable future.
10k albums is not that high for someone who is really into classical music. The advantage of a streaming service such as TIDAL is that you can listen to many more albums than you might want to purchase. I try to check out all new releases each week, and also look up artists that I become aware of that way. The collection on TIDAL is vast; 10k is a small fraction of their collection.
It would be nice if Roon could track albums beyond the 10k limit on TIDAL. I see no reason why Roon would need to impose the TIDAL limit in the local Roon library, why couldn’t Roon track the albums independently?