In anticipation of the fractional trading, any chance of implementing an investment plan where you pay in a certain amount every week/month and that gets invested in your selected stocks and weighting?
This would be a great way of building a predefined portfolio without continually having to buy certain fractional shares or putting small transactions through. Also in this scenario, you would naturally be indifferent to the live price and I would be more than happy to pay a monthly subscription for this (or you can include it in the isa subscription cost).
Also given you are so community focused, an ability to follow and publish portfolios might be good too. This would be conducive to long term portfolio aggregation and help prevent creating a short term trading mindset. I think you should publish warnings to users whom you feel might be going down that path.
To add some colour, I had applied for the revolut product development role for their share trading platform about 18months ago. They got me to put a fairly comprehensive case study together and then declined my application without commentary, in my eyes they can .
I’m 100% behind you guys and Monzo (you need to work on an integration with them too, like OakNorth and Mojo). I know that this has been suggested elsewhere.
Wish you all the luck,