First, this idea of "removing previous pickers" is against PG Music's mission statement. If you read through Band-in-a-Box's Wikipedia page, it says Band-in-a-Box has a long lasting reputation of having "Added features have been grafted on the original application for years which creates a "forest of hidden commands".
Hmm ... those words on the Band-In-A-Box Wikipedia page does
not make it a PG Music "mission statement".
The Wikipedia page attributes the words to critics of Band-In-A-Box.
PG Music have most certainly supported users from a long time back. I have great respect for that, but I do think perhaps they do it more than they should have. I think it's not unreasonable that people with multiple-years-old copies should be expected to update occasionally ... the Pro version is not a massive price at $129 amortised over decade is $13 per year. I
do though still think PGM could offer an update amnesty to further encourage historic users to update. Then, perhaps, some of the messier anomalies could be addressed properly, once and for all. What they lose on the amnesty they'd probably save on reduced development time alone.