Okay I'm caught up with Shield Hero's published novels and I wrote a review, I did my best to take consideration for those of you who care about spoilers hence the vague lack of description.

Shield Hero: An exposé on how to not turn your web novel into a light novel.

First things first, there is a TON of new content, out of the 10 volumes I read more than half of it was new, but overall I'd say this actually hurts the series, something I never imagined I'd say.

Volumes 1-4 were mostly the same with content added here and there, the one flaw of my review is that I remember the pope from the novel but feel like he was a later addition but I cant remember how the outcast situation got resolved without him.

Anyway volume 5 is when things change, half the content was new and several new major characters are focused on and introduce concepts from much later in the web novel earlier for better story flow, no issues at all here, it was actually a very good change, but it all goes down from here.

The Spirit Tortoise Arc is covered in volumes 6 and 7. I'll start with the good, Ost, pretty much everything about her addition to the series was well handled and well done, by far one of the better characters. Thats all the good.

In the web novel this arc isnt very long, it was about a 4 stage fight covered really fast which was kind of an issue in terms of plot relevance. But it was a much better alternative to what the light novel did, turn it into a 20 stage fight that is continuously making the protagonist lose or win a fight the wrong way, and connecting it to the plot changes in volume 5, by adding yet another insufferable twat psychopath that only cares for themselves, in a series that measures named characters with that main trait in the triple digits already. The 20 stages took about 400 pages of the 500 available, but without the fluff could easily have been covered in 200 or less with less than 10 stages while being a much more climactic fight. It could have been 1 volume easily if they covered the aftermath at the start of the next volume.
Ive never enjoyed a novel less in my life than these 2 volumes.

On to volume 8 and 9, it follows said twat psychopath into the newly focused on late series plot stuff, again not a bad idea, it introduces more good new characters but again refuses to advance without fluff and a 50 page fight. But atleast there was time to relax and have fun here and unlike the last 2 volumes.

10 is the start of the best arc in the series when we get the majority of the major characters and the plot slows down, sadly it too added a conflict that took up half the volume and honestly contributed nothing. I'd have put this as the climax of volume 7 and then slowly built up to the 8-9 content more organically with the new characters involved and started that at 10 once we had most of them, instead we feel less related to these characters and delayed major events vital to already introduced characters development, who will even renember the other 3 heroes at this point when we havnt seen them since the start of volume 6?

TLDR:
1. The author refuses to end a volume with new content on anything less than a 50 page fight, even if he has to write 200 pages of badly written fluff to do so.
2. The new content is placed en bulk all at once delaying vital events and characters to the series overall quality.
3. There's a pretty strong quality difference between the original content that had a framework and the new stuff that is pretty jarring due to the above.
4. The author is bad at fights and plot but the is really good at kingdom building stuff.

I recommend just reading the web novel since you can pretty much read all of it in the time it takes you read these 10 volumes and although some of its better youll get more enjoyment from being farther in the series with all the development that entails.