IMO the new filters are fine so long as any car using them has oil changed in accordance with service requirements .

The paper end caps on the filter would only become an issue if left in place for an excessive period. Sure, the metal filters are 'better' made and Subaru have no doubt changed due to economic reasons but, the filters probably surpas there requirements and would not be used with being up to standard.

Many filters have been changed over the years, not just the Subaru ones, all without issue. Not worth the argument IMO.

As for the temp rise, could be outside temp effect or different characteristic of the new oil. Would monitor temp over a similar period and see if there's an issue. As mentioned the temp increase is not that great and probably nothing to worry about.

As a side check, have you looked at the water levels. Low level, failing wTer pump could also be a contributing factor, although as it's straight after oil change, it would point to nothing more than using a different oil.