Renault may be respected but you clearly don’t understand part of the reason behind why Renault are struggling so much in the current era.
Renault farmed out KERS to the teams and had no expertise in that area. As such, with the new engines where you can’t separate the parts of the PU like that, they’re still playing catch up.
Not to mention that if they’re well respected, right now that doesn’t look very well placed if they’ve come up with an engine that’s worse than last year’s (if RB are to be believed and that is a big if…).
Changing to hybrid was always going to be difficult as it’s new technology – at F1 level at least – but it’ll pay dividends which again, is exactly what F1 should be IMO. Right now they’re ‘vastly complex’ because they’re still new to it but that’ll change – just look at engine (PU) changes – at the start of last year it was taking half a day. Now it’s down to three hours or so. Similarly, the engines will level out as the designs and concepts get shared as people move teams (see Bob Bell is now working for Renault).