LG soundbars have never set the world alight for their sound quality. Then again, it currently retails at around £90, and TBH, £90 retail isn't really enough cash to make and sell any sort of soundbar with a wireless sub that's going to lead to standing ovations. What we have here then is a soundbar that improves on the internal speakers of a TV, and that's probably the main reason most people buy this sort of thing.
Bearing in mind the price range, I think it's useful to take an objective view on the features and where the manufacturing budget is best spent.
The first question is whether the money out of the manufacturing budget for the sub is well used, or would it have better spent on the main soundbar performance or features? Next is what features do rival products have instead of the sub. LG puts a 5.25" bass driver of unspecified quality in to a lightweight MDF box. It would be unreasonable to expect such a sub to shake the room, but it will help the LG dig a little deeper, albeit in a kind of 'one-notey' fashion. The trade-offs are in the main bar drivers and in the lack of a HDMI ARC connection. A JBL Bar Studio doesn't have a sub, but does include a HDMI connection and arguably has better fidelity.
Whether an HDMI ARC connection is important or not depends on the TV features. Where a TV is equipped, it makes running the soundbar much simpler. The alternative of an Optical connection will deliver the same sound quality in the signal, but it means either keeping hold of the soundbar remote, or working out if the TV remote will do the soundbar as well.