I’d not say deprecate, I think it can be usefull in some constructions, but like in a Liana context, I really believe nobody uses sub-8 blocks granularity (or better say only uses for test purposes), so in our case it’s a no brainer to just change the flag in our wallet logic & change the factor applied to the slider used to select the timelock in our UI if one day we have to upgrade. But no strong opinion.