That is a more complete picture, imo. The truth of your fitness is the longer durations.
3.12w/kg FTP in June '18. Training with power and losing 8lbs resulted in this.
Strava power curve from the last 7 months:
5s: 13.54w/kg (1134w)
1m: 6.08 (483w)
5m: 4.06 (322w)
20m: 3.56 (283w)
1h: 3.16 (251w)
2h: 2.82 (224w)
3h: 2.57 (204w)
4hr: 2.52 (200w)
5hr: 2.46 (195w)
50 years old, 5'10"/177cm, 173lbs/78.5kg.
Last FTP update was Oct at 270w during an interval set, Strava, Xert and GC estimate it at 280w/3.56w/kg and my interval performance reflects that as well.