I did the same thing last year, watched 4 seasons over the course of a week.
I still haven't watched the season 5 finale I don't watch this show for tragedy, so there was no way I was going to watch everyone mourn Jack. I also didn't watch the end of the episode before because I knew it was coming. Also skipped the 2018 Christmas special just in case they talked more about it, I didn't love that they made Elizabeth pregnant either considering they'd been married all of 2 weeks before they were separated.
Skipping those episodes has made it a lot easier to watch this season, however cobbled together it was by having to take Lori out (I think they should've left her in, the season was already shot by the time the news broke).
I think the real issue is, they wanted to keep the show going beyond season 6 and they couldn't drag out the will they/won't they with their main characters any longer. They needed Elizabeth to be single again because people are tuning in for romance and romance on tv, especially Hallmark means, dating, engagement and wedding, not married life. None of the Hallmark movies have sequels where we see the couple married with kids. Viewers want a fantasy, and now its Elizabeth gets to start over and here are two potential new guys to date!