It's unrealistic to throw a bunch of guys together out of the Portal and expect them to gel as a team. Yes, a few players, but not your entire starting lineup. Michigan State struck gold, but it’s not sustainable in the long run and why would you want to rely on the Portal for a majority of your players? It means you lack in recruiting and failed to to develop the guys you did recruit.
If you simply leave your roster empty at each recruiting cycle because you think you can do better in the portal than with high school kids, you're making an assumption you'll get top players out if the Portal. That's a risky proposition.
The teams thst really heavily on the Portal are just not recruiting at a high level and/or not developing their players. That's what happened with Diaz. Had he been retained we would have had a 30-40ish class and forced to go heavy in the Portal.
Not everyone of our Portal transfers were productive. Tste Martell, Asa Martin, Trevor Hill, Tommy Kennedy, DeAndre Johnson.
Once Mario signs top 5 classes there will be very little need to hit the Transfer Portal. Maybe 2-3 per year due to guys transferring out.