I think the pie-in-pie feature became alot more complicated because the formula for minimum investment into a pie changed a while ago as it’s a £1 minimum per holding or something. Basically because those really tiny fractional orders were probably costing T212 money aswell as flooding their system, it meant problems with placing and cancelling orders because there were more users than expected. M1 runs a different system where orders are only executed twice per day or something for the free tier as all trades can then be aggregated.
Like I have only 21 holdings in a pie and my minimum deposit is £200. M1 I believe you can just shove $10 in there and let it go to work. Maybe T212 should implement a similar timed order system for pies.
But yeah, pies do seem half baked. I’ve setup friends and family with Autoinvest that will start getting charged soon. Probably should’ve just setup a Vanguard subscription for them.