Long time BTM guy here, well there were those darks years.... anyway I still have my "bowling comics" my kid calls it, but the last year(?) I have the online version.
I read many of the articles from different coaches to ball reviews. I don't buy balls Like I used to (own only 5 or 6 and use only 2 strike balls), but I use it to keep me up-to-date.
The articles that deal heavily on technical stuff outside the ball with formulas and pies and graphs, I tend to ignore. I'm sure elevation, humidity, 3/32 difference in release, and all that "nerdy" stuff make sense to engineers and physics majors, but prefer simple real world stuff instead of formulas and graphs.
I'm just glad BTM came back......