Steady folks!!
It is not wrong to grow in trays as many of you are doing all I have explained is; how I do it!!
Gardening is not an exact science so there are many ways to get good results.
For the record I went though a 'learning curve' as well, and in those days I didn't have forums like this to guide me, a lot was trial and error, and yes! as I recall; I grew in trays as well!!
So all I was doing was 'making a suggestion' giving an opinion even! which I will admit to always doing, when I reply to queries.
All I would add is; when transplanting them take care of the root system and you should be well rewarded.