I don't know how relevant it is but I had a pretty rough time with MH check in in MNL a few months ago on a CX issued RTW. The problem there is they are contract agents and are clueless about MH policies or OW elite benefits. I had 3x check in bags, which is not abnormal for me. They weren't particularly heavy but were too big and full to consolidate.

First they tried to claim that they only have xx KG allowances from MNL and didn't know about piece concept. Then after pushing back, explaining it wasn't a weight based ticket, the MH contract agents can only see 2x allowed on the ticket (piece concept ticket since it transited the USA). They don't understand that OW Emerald get 1 more no matter what, have to prove it to them on the MH website. This takes nearly 2 hours of calls between various supervisors, multiple screenshots they sent via Whatsapp... the flight was thank God 3 hours delayed or I'd have never made it. Fortunately it got sorted, but was a real sh*t show in true MH fashion. I felt bad for the guy trying to check me in, he got it, but was helpless to do anything that his contracted system didn't allow him, and adding a 3rd bag wasn't one of them.

With other airlines I'd have said F*-it and paid a fee, applied for a refund later, but I don't trust MH any further than I can see them to do the right thing. I've had good experiences with them in general, including really good treatment and rescheduling during IRRPOS, but I know about the thousands of other horror stories of folks who haven't. I knew because of the crazy delay that day, I had ample time, so just rode it out until they figured it out.