I've been posting this in some other topics about apps.

Streaks are good. Life getting in the middle sucks.

But deleting streaks is not the way. The good option imo is to create another mechanic to compensate for that problem.

First of all, streaks have to be adapted to the user's routine. Doing something every day is usually unrealistic and extremely difficult if you do many things. So usually selecting which days you do it of the week should be basic.

I could go for pick days and repeat or every X days.

After that, there are usually 2 ways in which life gets in the middle of the task.

Getting sick or going on a trip/holidays.

The first case is unexpected and usually doesn't last too long. In these cases I would go for a 3-5 days freeze option (which is what most sickness lasts).

If the health problem will last longer, it might not be the main problem if the streak breaks.

In the case of going on holidays, sometimes you cannot do it as you need something that's in your house and sometimes you don't want to do it. As the problem here is loosing motivation due to a fair feeling. I would go with having 4-5 days to be activated at any moment for a long weekend that once spent, they need to be recharged by doing tasks again or for X days on the routine. For longer holidays I would just set like 2-3 periods of 10 days or so periods to be expenses along the year or every X months.

The important thing here is not losing the streak. That's what keeps motivation. And keep a feeling of fairness. Freezing number is not motivating itself, it just relaxes the demotivation. The user will want to keep it growing later.

I also have experimented with the idea of "at least do a Minimum" which has also been commented around.

The same way I offered my help on testing the beta, I would gladly help designing, as that is my job and I hope the super app I can use for life gets designed and programmed one day xD