I thought it was bad to start a seedling in a larger pot? so is this good to you?
The belief that you should, or that it is better, to start seedlings in small containers and up-pot them a time or two, or whatever, until you finally put them in a pot size you will finish them in is one of the longstanding myths about growing.
If that were the case, if seedlings needed to or grew better when started in small containers please explain why plants grown outdoors, with the entire planet being their pot, they grow so well.
Some people say that seedlings need to create a nice small well formed root-ball to then be moved to larger sized pots for them to grow well. If that were the case don't you think that the thousands and thousands and thousands of years of evolution would have evolved plants to grow tight small root-balls in nature, when growing outside where root-space is nearly limitless? But that isn't how plants grow when allowed to grow as they have evolved, is it?
Along with four family members I am an owner in a pot-in-pot nursery, trees and bushes, not plants, that covers about 17 acres now. Because
there is a market for smaller sized trees and bushes we do grow in various different sized containers. Anything that does not sell before it needs to be up-potted is then moved into a larger sized pot. But because there is also a market for larger sized trees and bushes we do grow some just for that market. We cannot always rely on there always being enough 'leftovers' to keep up-potting to get the larger sizes we need so we do plant some just to grow to larger sizes and we put them right in large pots, some 25 gallon size and some much larger, and they love it and they grow great.
Ever since we started the nursery and went that route I started growing that way and I would not go back to small containers and up-potting. You never risk having a root-bound situation. You never risk shocking your plants when up-potting. You never risk damaging your plants handling them when up-potting.
People claim you risk an over-watering situation, too much moisture being available and possible root-rot problems. Well small roots that are only inches into soil can only access the moisture they are actually in contact with. Moisture deeper down and farther to the side does not cause any problems. It cannot rise up until the upper soil is dried out, and then it will slowly wick up, but not at a rate that is too much or fast enough to cause any problems. You can have a seedling in a 7-gallon pot where the bottom is very moist but the layer of soil where the seedlings roots are in can get more than dry enough that you will need to water. The surface soil can dry to dust and the lower part of the soil can be more than just moist.
It is not uncommon for me to have a small amount of water in the drip trays, meaning the lowest layer of soil is still very wet, and the upper layer is totally dried out.
The belief that plants need to be started in small containers, or that they grow better that way, is accepted because nurseries that grow plants, mainly in greenhouses, have to maximize their space so they start plants in containers that are as small as possible and they can then ship far more of them on each truck to the retail outlets. It all cuts cost and increases profits, which is why it is done, and not because that is how plants grow best.