"If you participate in activity X it will leave less time for spiritual activities"
Here is a psychological flipside:
If you participate in Spiritual Activities™ to the exclusion of everything else, doesn't that make you a fanatic? obsessed? an addict?
If you wanted to participate in another activity but Spiritual Activities™ crowded out time for recreational activities, don't you think that a person could become resentful at never having time to do the things that interest them? Wouldn't it be better to enjoy an interest or activity instead of ending up feeling resentment toward Spiritual Activities™?
Why would Jehovah give me the talent AND the interest in a certain activity and then not want me to develop those interests? Doesn't that seem unloving for him to do that? Wouldn't he feel insulted if he gave us those gifts and talents and we didn't develop them? Doesn't that show a lack of gratitude for what God gave us?
There are 5 meetings a week, plus X number of opportunities to participate in the preaching work. There are not always that many opportunities to participate in personal interests, especially if taking a class is involved and working that into a busy schedule. The meetings are not going anywhere. The Watchtower Study can be reviewed any time as long as you have the material handy.
And this is where the ultimate test comes in (I used it myself when I was trying to decide whether or not to quit the JWs): If I skipped the meetings for a week, and nobody called to see what had happened, I skipped them again for another week. If nobody called after that point, I skipped a third week, and so on and so on. What it boiled down to, for me, was that if this Organization was truly showing the love that Jesus promised would be evident among his true disciples, I wouldn't need to wait for a phone call or a visit. The Brothers™ and Sisters™ would be motivated by love and concern to find out what was keeping me away from the meetings. They didn't. It took MONTHS before anyone noticed that I'd been missing. I was one of those Sisters™ who used to comment at every meeting. I would get asked to prepare an impromptu talk when someone didn't show up. I was regular in service. I would do almost anything for anyone in the congregation to help them, sometimes to my own detriment. And then I got sick.... and it was as though they threw me away because I was no longer useful.