I think it really depends on the dollar amount. I think some of the comments in the thread (as well as the tough loss of a season for QP) are a cautionary tale to tap the brakes. There are others that are far better at projecting the Arby Years than I...
A deal to just buy out the arby years doesn't seem to make sense for the club perspective. Why take on injury risk and opportunity cost that could go south with an injury, or the potential for inconsistent performance. On the other hand, while its annoying to have $20M+ tied up in Woody this year with his injuries, the potential for "playoff ace" Woody on a one-year commitment at that price seemed to be worth the risk.
So for Harrison, if we assume $1M, $4M, $8M, $12M (assuming he performs well), that is $25M over the next 4 for the club (assuming year to year). I still think that 5th year for us (would be 2031), could have some excess value if this keeps up, but probably not enough excess value over 2 years compared to what it would cost us to get him to sign... So maybe you split the difference and offer $25M over the 4 years, with a team option ($5 million buyout or $20 million salary) to make it either 4/30, or 5/45 if you think that 2031 could be a "go for it year"...
If our goal is to be competitive every year, with maybe a 1-2 year "go for it"" window every 5-6, maybe it isn't worth it in the same way it would be if adding the 5th year would have been in 2028 or 2029.
All that said, if we have QP this deal (mid-season), and now he'd be likely missing this entire season with the potential for no season in 2027, and I wouldn't feel great about paying for 2 seasons without getting any real production.