To be fair there is a massive difference between not breaking 40 and being Tanev, who has one season with more than 20 points to his name in his career.
In his Flames career you could be right about him not breaking 40 mostly because there is about a 5% chance Parekh doesn’t own the top powerplay for the Flames for a decade plus, and roughly 10 defenseman league wide hit 40 ESP per year. His vision for making plays in the O-Zone and the breakout is just too great for him ever to have a Tanev-esque career though.
Back on topic to Mews, he could force some very interesting decisions in 3-4 years for Calgary. Considering Weegar a LD even though he’s playing on the right side currently, Calgary has Andersson and Pachal (a 25 year old providing fantastic minutes as a 5D currently) as notable RD on the roster and all of Parekh, Mews, and Brzustewicz as high potential prospects. On the left side Calgary has Weegar and 4 young defenseman in Bahl, Kuznetsov, Morin, and Grushnikov. Calgary is going to be able to trade some very good defenseman for forward help down the line to make the log jam work. In 3-4 years:
Bahl-Andersson/Parekh
Weegar-Brzustewicz/Mews
Kuznetsov/Morin-Pachal/Mews
Grushnikov
Considering Brzus and Parekh as >80% chance of being NHLers and Mews and Morin as ~50%, Calgary likely has 3 defenseman and/or prospects they need to trade in the next 3 years.
Fun side note, last season Calgary had 4 defense prospects top 10 in P/GP in their respective CHL leagues. This year, Calgary has 3 within the top 3 of their respective leagues.