Not 30 seconds, but with 2 vet3 sweeper SPIOS and a teched repair truck, it should take 1 minute at max. See, that is a hefty investment on repairs alone.
Yes. The alternative we have here is the tiger/IS2 situation, it takes up to 5 minutes to bring these cats back into the match.
Currently 10% HP King Tiger with Mech and 2x vet 3 SPIOS needs 23secs to be 100% HP.
10% Tiger with 2x vet 2 Pios need 47secs to be 100%HP.
Of course with sweeper upgrade.
It's too much in favour of WFA and Brits since Pios and CE are real investment for repairs (+way longer repairs) while Spios, RE and RE have also great battle utility so they are not "one-way" investments.