A good groovebox doesn't have to be crippled. Yamaha did an excellent job with their QY-series, the QY-70 and QY-100 being completely fully fledged sequencers with many advanced features in addition to having very groovebox-like functionality. I feel that we have actually gone backwards in the last 20 years especially. Grooveboxes are easier to use and get going with than they used to be but lack a lot of features they used to have. Why not at least throw in a MIDI event list editor these days? But they often don't. Peak groovebox was the Yamaha RS7000, it has never been improved upon. Same basic software roots that they had in the QY series and the Yamaha sequencers you used to get in their flagship workstations before the color touch-screen era.